Maharashtra Board Class 9 Geography Chapter 4 Exogenetic Movements Part 2 Solutions

Exogenetic Movements Part 2 Class 9 Questions And Answers Maharashtra Board

Class 9 Geography Chapter 4 Exogenetic Movements Part 2 Questions And Answers Maharashtra Board

Geography Class 9 Chapter 4 Question Answer Maharashtra Board

1. Rewrite the correct statement:

 

Question 1. The temperature range helps the wind in its work.
Answer: Correct.
In simple words: A larger temperature difference creates stronger winds, which are more effective at shaping landforms.

🎯 Exam Tip: Understanding the relationship between temperature range and wind activity is key for questions on wind erosion.

 

Question 2. River's work is more prominent than other agents of erosion in desert regions.
Answer: Incorrect. Work of wind is more prominent in desert regions than other agents of erosion.
In simple words: In deserts, wind erosion is more dominant than river erosion because of the dry climate and lack of consistent water flow.

🎯 Exam Tip: Remember to differentiate the primary agents of erosion for various climatic regions (e.g., wind in deserts, rivers in humid regions).

 

Question 3. The work of groundwater is effective in the area with soft rocks.
Answer: Correct.
In simple words: Groundwater easily dissolves and erodes soft, permeable rocks like limestone, leading to the formation of caves and sinkholes.

🎯 Exam Tip: Identifying rock types (soft/hard) and their susceptibility to groundwater erosion is an important concept.

 

2. Correct and rewrite the incorrect statements:

 

Question 1. The ice on the lateral side of the glacier moves faster than the ice at the base.
Answer: Incorrect. The ice on the base of the glacier moves faster than the ice on the lateral side.
In simple words: Ice at the base of a glacier experiences less friction than ice along the sides, allowing it to move faster.

🎯 Exam Tip: When discussing glacier movement, factors like friction and pressure affecting different parts of the ice mass are crucial.

 

Question 2. The depositional work by rivers happens because of gentle slope, reduced speed and transported sediments.
Answer: Correct.
In simple words: Rivers deposit sediments when their flow slows down due to flatter land or a decrease in water volume, as they can no longer carry the load.

🎯 Exam Tip: Connect depositional processes with a decrease in river energy (slope, speed) and an increase in sediment load.

 

Question 3. A river flows at a faster speed than the glacier.
Answer: Correct.
In simple words: Water in a river is a liquid and flows quickly, while glaciers are solid ice that move much slower due to their viscosity and friction with the ground.

🎯 Exam Tip: The state of matter (liquid vs. solid) is a primary determinant of flow speed for agents of erosion.

 

Question 4. The speed of the glacier is more on both the banks than in the middle.
Answer: Correct.
In simple words: The center of a glacier moves faster than its edges because the edges experience more friction with the valley walls.

🎯 Exam Tip: Internal friction and friction with surrounding landforms affect the velocity distribution within a glacier.

 

3. Identify the wrong pair

 

Question 1. Deposition - V-shaped valley
Answer: Wrong pair. Correct pair is - Erosion - V-shaped valley
In simple words: V-shaped valleys are formed by the erosional action of rivers, not by deposition.

🎯 Exam Tip: Clearly distinguish between landforms created by erosion and those created by deposition.

 

Question 2. Transport - Ripple Marks
Answer: Transport - Ripple Marks
In simple words: Ripple marks are formed by the movement (transportation) and minor deposition of sand particles by wind or water.

🎯 Exam Tip: Ripple marks are good indicators of the direction and intensity of past fluid flow, emphasizing transport processes.

 

Question 3. Erosion - Mushroom Rocks
Answer: Erosion - Mushroom Rocks
In simple words: Mushroom rocks are unique landforms created by wind erosion, where the base of the rock erodes faster than the top due to sandblasting effects.

🎯 Exam Tip: Wind erosion often creates distinctive shapes like mushroom rocks due to differential erosion rates at different heights.

 

4. Identify and name the landforms in the following diagrams :

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र विभिन्न भू-आकृतियों को दर्शाता है जो अलग-अलग भूगर्भीय प्रक्रियाओं द्वारा बनती हैं। इनमें 'V' आकार की घाटी, गॉर्ज (कैनियन) और डेल्टा शामिल हैं, जो क्रमशः नदी के कटाव और जमाव के कार्य को दर्शाते हैं, जिससे छात्र इन भू-आकृतियों के निर्माण को बिना किसी छवि फ़ाइल के लोड किए समझ सकें।

Answer:
(i) V-shaped valley
(ii) Gorge (Canyon)
(iii) Delta
In simple words: These diagrams illustrate landforms like V-shaped valleys and gorges, which result from river erosion, and deltas, which are formed by river deposition.

🎯 Exam Tip: Being able to visually identify landforms and link them to their formative processes (erosion or deposition) and agents (river, wind, glacier) is crucial.

 

5. Complete the following table by classifying the landforms according to their agents of erosion.

(waterfall, delta, cirque, arête, barchans, moraine, pothole, mushroom rock, sinkholes, beach, pillars, lagoons)

Rivers Wind Glacier Sea Waves Groundwater

Answer:

Rivers	Wind	Glacier	Sea waves	Ground Water
Waterfall	Barchans	Cirque	Beach	Sinkholes
Delta	Mushroom rock	Aretes	Lagoons	Pillars
Pothole		Moraine

In simple words: This table categorizes various landforms based on the primary natural agent (rivers, wind, glaciers, sea waves, or groundwater) responsible for their creation through erosion or deposition.

🎯 Exam Tip: Memorizing the specific landforms associated with each agent of erosion/deposition is essential for classification questions.

 

6. Answer the following questions in brief.

 

Question 1. List the landforms that are a result of the erosional work of the rivers.
Answer: Gorges (canyons), V-shaped valleys and waterfalls are the result of the erosional work of the rivers.
(i) 'V' Shaped Valley:
• A 'V shaped valley is formed due to the erosional work of a river.
• Over a period of time, the amount of load in the flow starts increasing.
• More and more energy of the river gets consumed in transporting the material.
• As a result, there is less erosion of the bed. The erosion along the banks and the slopes of the valley increases.
• Hence, the slopes recedes and the valley with near-vertical sides becomes wider, resembling the letter 'V'.
(ii) Gorge:
• A gorge is found in the upper course of the river.
• It is a deep and narrow valley with steep sides.
• In mountainous areas, the river flows with great speed. Therefore, the bed of the river gets eroded more than its banks, giving rise to a gorge that has a steep banks and a narrow bed.
(iii) Waterfall:
• Waterfalls are formed as a result of the erosional work of a river.
• Water flowing over a hilly region cascades down a cliff, forming a waterfall.
• In the areas, where the hard and soft rocks are next to each other, the soft rocks are eroded faster than the hard ones. A difference in the height along the river bed leads to the formation of a waterfall.
In simple words: Rivers erode the land to create specific features like deep, narrow gorges, V-shaped valleys with steep sides, and waterfalls where water plunges over rock differentials.

🎯 Exam Tip: When describing river erosional landforms, include details about the river's speed, gradient, and the type of rocks it encounters.

 

Question 2. Which agent is responsible for the formation of stalactites and stalagmites and where are they formed?
Answer:
• The work of groundwater is responsible for the formation of stalactites and stalagmites.
• In areas of limestone, the alkaline water seeps through the roof of the limestone caves.
• When this water evaporates, minerals get deposited at the bottom and at the top of the limestone caves.
• This leads to formation of stalactites and stalagmites.
In simple words: Groundwater, rich in dissolved minerals from limestone, creates stalactites (hanging from the roof) and stalagmites (growing from the floor) in caves through a process of evaporation and mineral deposition.

🎯 Exam Tip: Focus on the chemical process of dissolution and redeposition of minerals by groundwater in limestone areas.

 

Question 3. List the landforms that are produced by the depositional work of the sea waves
Answer: The landforms like beaches, sand bar, lagoons are formed due to depositional work of the sea waves.
(i) Beach:
• Large amount of sediments come from the landward side in areas between two adjoining headlands.
• Moreover, as these areas are shallow, the velocity of the waves decreases.
• As a result, the sediments that come from the land, as well as those coming from the deep sea, get deposited in this area.
• Predominantly fine sand gets settled along the coast.
• Such sandy deposits along the coasts are called beaches.
(ii) Lagoon:
• The brackish water separated from the seawater by sand bars and lying in the areas between the coast and bars is called a lagoon.
• As the waters are separated from the open sea, large waves are not generated.
• These lagoons run parallel to the sea coast.
(iii) Sand bars:
• Sand gets deposited along the sides of the headlands.
• The deposition extends parallel to the coast from one headland to the next.
• Over a period of time, these deposits extend over long distances forming bars that protrude into the water at some distance away from the beach.
• These are known as 'sand bars', Sometimes, the eroded material from the' beach, gives rise to the sand bars.
In simple words: Sea waves deposit sediments to form various coastal features such as sandy beaches, enclosed lagoons, and elongated sand bars that separate sections of water.

🎯 Exam Tip: Emphasize how wave energy reduction, shallow waters, and abundant sediment supply lead to coastal depositional landforms.

 

Question 4. Name the types of moraines.
Answer: The glaciers carry sediments with them. These sediments are called moraines. Depending ond the location of the deposits, moraines can be divided into 4 types: ground moraines, lateral moraines, medial moraines and terminal moraines.
• The material deposited at the base of a glacier is called ground moraine.
• The material deposited along the banks of a glacier is called Lateral moraine.
• After the confluence of two glaciers, the moraine deposited in the central part of the glacier is known as medial moraine. It is formed out of . the side moraine of the inner banks of the two glaciers.
• At the end where a glacier turns into a stream, huge quantity of moraine is deposited. The stream of water is unable to carry the moraine further. As the deposited moraine is at the terminal part of a glacier, it is called terminal moraine.
In simple words: Moraines are accumulations of glacial debris, classified into ground, lateral, medial, and terminal types based on their position relative to the glacier.

🎯 Exam Tip: For moraines, remember to describe each type by its location of deposition relative to the glacier's body and movement.

 

7. Observe the following picture carefully. Identify the landforms formed by different agents of erosion. Number them with a pencil here and write their names in the sequence in your notebook.

ℹ️ चित्र व्याख्या (Diagram Explanation): यह एक विस्तृत भू-परिदृश्य को दर्शाता है जिसमें नदी, ग्लेशियर, हवा और समुद्री लहरों के विभिन्न भू-आकृतियाँ शामिल हैं। इसमें ऊँचे पहाड़, गहरी घाटियाँ, बहती नदियाँ, समुद्र तट और संभावित ज्वालामुखी गतिविधियाँ दिखाई गई हैं, जो पृथ्वी की सतह पर बाहरी प्रक्रियाओं के प्रभावों को स्पष्ट करती हैं।

 

(i)

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र जलोढ़ पंखों (Alluvial fans) को दर्शाता है, जो नदियों द्वारा पर्वतीय क्षेत्रों से लाई गई सामग्री के जमाव से बनते हैं। ये आमतौर पर नदी के घाटी से बाहर निकलने पर पंखे के आकार में फैल जाते हैं, जिससे उपजाऊ मैदानी क्षेत्र बनते हैं।

Answer: Alluvial fans
Depositional work of river
In simple words: Alluvial fans are cone-shaped deposits of sediment formed where a river emerges from a mountain valley onto a flatter plain.

🎯 Exam Tip: Recognize alluvial fans as key depositional features found at the base of mountains, indicating a change in river gradient.

 

(ii)

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र बाढ़ के तटबंधों (Flood levees) और बाढ़ के मैदानों (Flood plains) को दर्शाता है, जो नदियों द्वारा बाढ़ के दौरान बहाकर लाए गए तलछट के जमाव से बनते हैं। तटबंध नदी के किनारे पर ऊँचे रिज होते हैं जबकि बाढ़ के मैदान चौड़े, समतल क्षेत्र होते हैं।

Answer: Flood levees and flood plains
Depositional work of river
In simple words: Flood levees are natural embankments alongside a river, and flood plains are flat areas formed by sediment deposition during floods.

🎯 Exam Tip: Understand that flood levees and plains are common features in the middle and lower courses of rivers, resulting from repeated flooding and sediment deposition.

 

(iii)

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र एक 'V' आकार की घाटी को दर्शाता है, जो नदियों द्वारा तीव्र कटाव के कारण बनती है, खासकर पहाड़ी या ऊपरी नदी मार्ग में। नदी का प्रवाह घाटी के तल को गहरा करता है, जिससे खड़ी ढलानें बनती हैं जो 'V' अक्षर के समान दिखती हैं।

Answer: 'V' shaped valley
Erosional work of river
In simple words: A V-shaped valley is a typical landform in the upper course of a river, characterized by steep sides formed by strong downward erosion.

🎯 Exam Tip: V-shaped valleys are definitive signs of active downcutting by rivers in mountainous or elevated regions.

 

(iv)

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र एक डेल्टा को दर्शाता है, जो नदी के मुहाने पर तलछट के जमाव से बनता है, जहाँ नदी समुद्र या झील में मिलती है। ये आमतौर पर त्रिकोणीय या पंखे के आकार के होते हैं, जिनमें कई वितरिकाएँ होती हैं।

Answer: Delta
Depositional work of river
In simple words: A delta is a triangular-shaped landform at a river's mouth, created by the deposition of sediments as the river's speed decreases when entering a larger body of water.

🎯 Exam Tip: Deltas are prime examples of extensive river deposition, indicating a reduction in flow energy at the river's end.

 

(2) Some pictures of the landforms formed by glaciers are given below. Write the function because of which they have been formed.

 

(i)

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र सर्क (Cirques) और हॉर्न (Horn) को दर्शाता है, जो ग्लेशियरों द्वारा पहाड़ी ढलानों के तीव्र कटाव से बनते हैं। सर्क कटोरे के आकार के खोखले होते हैं, जबकि हॉर्न तीन या अधिक सर्कों के मिलन से बनी नुकीली चोटियाँ होती हैं।

Answer: Cirques and horn
Erosional work of glacier
In simple words: Cirques are bowl-shaped hollows carved by glaciers, and horns are sharp, pyramidal peaks formed when multiple cirques erode a mountain from different sides.

🎯 Exam Tip: Cirques and horns are characteristic features of alpine glacial erosion, indicating intense ice sculpturing in mountainous terrain.

 

(ii)

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र एक 'U' आकार की घाटी को दर्शाता है, जो ग्लेशियरों द्वारा व्यापक कटाव के परिणामस्वरूप बनती है। ग्लेशियर अपनी गति के साथ घाटी के तल और किनारों को घिसते हुए एक विशिष्ट 'U' आकार की क्रॉस-सेक्शन बनाते हैं।

Answer: 'U' shaped valley
Erosional work of glacier
In simple words: U-shaped valleys are broad, deep valleys with steep, often smooth sides and a flat floor, typically formed by the erosional action of a moving glacier.

🎯 Exam Tip: U-shaped valleys are distinct from V-shaped river valleys and are clear indicators of past or present glaciation.

 

(iii)

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र पार्श्व (Lateral) और मध्यस्थ (Medial) मोरेनों को दर्शाता है। पार्श्व मोरेन ग्लेशियरों के किनारे पर जमा मलबे होते हैं, जबकि मध्यस्थ मोरेन तब बनते हैं जब दो ग्लेशियर मिलते हैं और उनके पार्श्व मोरेन मिलकर घाटी के बीच में एक नई लकीर बनाते हैं।

Answer: Lateral and Medial moraines
Depositional work of glacier
In simple words: Lateral moraines are rock and sediment ridges along the sides of a glacier, while medial moraines form in the middle when two glaciers merge, carrying debris from their inner edges.

🎯 Exam Tip: Understanding the location of different moraine types helps in reconstructing glacial flow patterns and past ice extents.

 

(iv)

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र ग्लेशियरों द्वारा जमाव से बनी एक भू-आकृति को दर्शाता है, जहाँ ग्लेशियरों द्वारा बहाकर लाई गई रेत, बजरी और चट्टानों जैसी सामग्री को एक स्थान पर जमा किया जाता है, जिससे विभिन्न प्रकार के मोरेन या अन्य हिमनदी निक्षेप बनते हैं।

Answer: Depositional work of glacier
In simple words: This image shows landforms created by the accumulation of rock and sediment carried and then dropped by glaciers, a process known as glacial deposition.

🎯 Exam Tip: Be able to identify general depositional landforms associated with glaciers, even without specific names if not provided in the prompt.

 

(v)

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र ग्लेशियरों के कटाव कार्य से बनी एक भू-आकृति को दर्शाता है, जिसमें चट्टानों को ग्लेशियरों द्वारा घिसकर, रगड़कर या खींचकर आकार दिया गया है, जिससे उनकी सतह पर चिकनी या खुरदरी आकृतियाँ बनती हैं।

Answer: Erosional work of glacier
In simple words: The image displays landforms sculpted by the abrasive and plucking actions of glaciers, which are powerful erosional forces.

🎯 Exam Tip: Focus on the characteristic features of glacial erosion, such as smoothed rock surfaces or sharp, angular forms, as evidence of ice movement.

 

(vi)

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र एक हैंगिंग घाटी को दर्शाता है, जो एक छोटी सहायक घाटी होती है जो मुख्य घाटी से अधिक ऊँचाई पर समाप्त होती है। यह ग्लेशियरों द्वारा असमान कटाव के कारण बनती है, जहाँ मुख्य ग्लेशियर सहायक घाटी की तुलना में अधिक गहरा कटाव करता है।

Answer: Hanging valley
Erosional work of glacier
In simple words: A hanging valley is a tributary valley that is perched at a higher elevation than the main glacial valley, typically because the main glacier eroded deeper.

🎯 Exam Tip: Hanging valleys are distinct indicators of differential glacial erosion, often associated with waterfalls where the tributary meets the main valley.

 

(vii)

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र एस्कर (Eskers) को दर्शाता है, जो ग्लेशियरों के नीचे या भीतर की सुरंगों में बहने वाली नदियों द्वारा जमा की गई रेत और बजरी के लंबे, घुमावदार टीले होते हैं। ये पिघलते ग्लेशियरों के अवसादी निक्षेपों का प्रतिनिधित्व करते हैं।

Answer: Eskers
Depositional work of glacier
In simple words: Eskers are long, winding ridges of stratified sand and gravel, deposited by meltwater rivers flowing within or beneath a glacier.

🎯 Exam Tip: Eskers are fluvio-glacial landforms, meaning they are formed by both ice and water, and are key indicators of past subglacial drainage systems.

 

(3) Some pictures of the landforms produced by the work of the winds are given below. See the pictures and write in the box whether they have been formed by erosion or deposition.

 

(i)

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र एक मशरूम चट्टान को दर्शाता है, जो हवा द्वारा निचले हिस्से में अधिक कटाव के कारण बनती है, क्योंकि निचले स्तर पर रेत के कण अधिक घर्षण करते हैं, जिससे चट्टान ऊपर से चौड़ी और नीचे से पतली होकर मशरूम का आकार ले लेती है।

Answer: Mushroom rock
Erosional work of wind
In simple words: Mushroom rocks are formed when wind-borne sand particles erode the base of a rock more quickly than its top, creating a distinctive mushroom-like shape.

🎯 Exam Tip: The differential erosion caused by wind abrasion at varying heights is the key to explaining mushroom rock formation.

 

(ii)

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र एक रेतीले टीले (Sand dune) को दर्शाता है, विशेष रूप से एक बरचान (Barchan), जो हवा द्वारा रेत के जमाव से बनता है। ये आमतौर पर रेगिस्तानी क्षेत्रों में अर्धचंद्राकार आकार में होते हैं, जिनके किनारे हवा की दिशा में आगे बढ़ते हैं।

Answer: Sand dune (Barchan)
Depositional work of wind
In simple words: Barchans are crescent-shaped sand dunes formed by wind deposition, with their horns pointing downwind, common in sandy deserts.

🎯 Exam Tip: Identifying barchans as a type of sand dune and linking them to wind deposition in arid environments is fundamental.

 

(iii)

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र लहर चिह्नों (Ripple marks) को दर्शाता है, जो हवा द्वारा रेत की सतह पर छोटे, समानांतर लकीरों के रूप में बनते हैं। ये रेत के कणों के जमाव और गति को दर्शाते हैं, जिससे सतह पर एक विशिष्ट पैटर्न बनता है।

Answer: Ripple marks
Depositional work of wind
In simple words: Ripple marks are small, wave-like ridges formed on the surface of sand or sediment by the action of wind or water, indicating minor deposition and movement.

🎯 Exam Tip: Ripple marks are small-scale features of deposition and indicate the direction of the transporting agent (wind or water).

 

(iv)

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र सीफ (Seif) या रेतीले टीलों (Sand Mounds) को दर्शाता है, जो हवा द्वारा रेत के जमाव से बनने वाले लंबे, रैखिक रेत के टीले होते हैं। ये अक्सर रेगिस्तानी परिदृश्य में पाए जाते हैं और हवा की प्रचलित दिशा के समानांतर चलते हैं।

Answer: Seif (Sand Mounds)
Depositional work of wind
In simple words: Seif dunes are long, linear sand ridges, often very tall, formed by winds blowing from two slightly different directions, creating a depositional landform.

🎯 Exam Tip: Seif dunes, like barchans, are important wind depositional features, but their elongated shape suggests more complex wind patterns.

 

(v)

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र यारडंग (Yardang) को दर्शाता है, जो हवा द्वारा नरम चट्टान सामग्री के कटाव से बनती है, जिससे लंबी, अनियमित, और लहरदार लकीरें या टीले बनते हैं, जो हवा की दिशा में फैले होते हैं।

Answer: Yardang
Erosional work of wind
In simple words: Yardangs are elongated, streamlined ridges of rock, carved by the abrasive action of wind carrying sand, typical of arid regions.

🎯 Exam Tip: Yardangs are distinctive wind erosional features that align parallel to the prevailing wind direction, showcasing wind's sculpturing power.

 

(vi)

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र हमादा (Hamada) को दर्शाता है, जो एक प्रकार का रेगिस्तानी परिदृश्य है जहाँ हवा के कटाव से रेत और महीन कण हट जाते हैं, जिससे नंगे, चट्टानी या बजरीदार सतहें रह जाती हैं। यह कठोर और पथरीला रेगिस्तानी मैदान होता है।

Answer: Hamada
Erosional work of wind
In simple words: A hamada is a type of desert landscape characterized by a barren, rocky plateau from which all sand and fine particles have been removed by wind erosion.

🎯 Exam Tip: Hamadas represent the extreme erosional power of wind, leaving behind only the most resistant rock surfaces.

 

(4) Some pictures of the landforms produced by the work of the sea waves are given below. See the pictures and write in the box whether they have been formed by erosion or deposition.

With the help of internet, obtain information regarding the places along the Konkan coast where you will find the landforms formed by sea waves.

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र समुद्र तट पर बनी एक गुफा को दर्शाता है, जिसमें लहरों के कटाव के कारण चट्टानों में खोखले स्थान बन गए हैं। अंदर की ओर चिकनी दीवारें और बाहर की ओर ऊबड़-खाबड़ चट्टानें समुद्री लहरों की लगातार क्रिया को इंगित करती हैं।
**Answer:****Answer:** Erosional work of sea waves.
**In simple words:** Sea caves are formed when sea waves continuously erode soft parts of coastal rocks, creating hollows and caves over time.

🎯 Exam Tip: When identifying landforms, differentiate between erosional and depositional features, noting how their formation relates to the agent's action on the coast.

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र एक लैगून को दर्शाता है, जो समुद्र तट के समानांतर एक संकरी पट्टी (जैसे सैंड बार) द्वारा मुख्य समुद्र से अलग किया गया एक उथला खारे पानी का निकाय है। चित्र में लैगून का गहरा नीला पानी और उसे घेरने वाली तटरेखा और रेतीली पट्टी दिखाई गई है।
**Answer:****Answer:** Depositional work of sea waves
**In simple words:** Lagoons are formed when sandbars or spits create a barrier, trapping a body of water behind them and separating it from the open sea.

🎯 Exam Tip: Lagoons are key examples of depositional landforms created by sea waves, often indicating areas of reduced wave energy where sediments accumulate.

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र एक वेव-कट प्लेटफॉर्म को दर्शाता है, जो समुद्र तट पर चट्टानों के कटाव से बना एक सपाट, चट्टानी मंच है। यह आमतौर पर ज्वार के निम्न स्तर पर दिखाई देता है, जहाँ लहरों की लगातार क्रिया चट्टान के निचले हिस्से को काट देती है, जिससे ऊपर की चट्टान गिर जाती है और एक समतल सतह बन जाती है।
**Answer:****Answer:** Erosional work of sea waves.
**In simple words:** A wave-cut platform is a flat rock surface created by the continuous erosive action of sea waves cutting into the base of a cliff.

🎯 Exam Tip: Wave-cut platforms are clear indicators of marine erosion, showing how sea waves flatten coastal areas over long periods.

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र एक समुद्री मेहराब (सी आर्च) को दर्शाता है, जो समुद्र में चट्टान के आर-पार लहरों द्वारा बनाए गए एक प्राकृतिक पुल जैसा है। यह तब बनता है जब समुद्री गुफाएँ एक-दूसरे से मिलती हैं या जब एक कमजोर चट्टान का हिस्सा पूरी तरह से कट जाता है, जिससे केवल मेहराब जैसा ढाँचा शेष रह जाता है।
**Answer:****Answer:** Erosional work of sea waves.
**In simple words:** A sea arch is a natural arch formed by the sea's erosive power when waves cut through a headland, creating an opening.

🎯 Exam Tip: Sea arches are striking examples of differential erosion, where softer rock erodes faster, leading to distinct arch formations over time.

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र एक समुद्री कगार (सी क्लिफ) को दर्शाता है, जो समुद्र की ओर एक खड़ी चट्टानी दीवार है। इसका निर्माण समुद्री लहरों की कटाव क्रिया के कारण होता है जो तटरेखा पर लगातार प्रहार करती हैं, जिससे चट्टानें गिरती रहती हैं और एक ऊँची, सीधी ढलान बन जाती है।
**Answer:****Answer:** Erosional work of sea waves.
**In simple words:** A sea cliff is a steep, vertical rock face formed by the continuous erosive action of waves undercutting the base of the land.

🎯 Exam Tip: Sea cliffs illustrate the powerful erosional force of sea waves, especially on coastlines composed of resistant rocks.

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र एक रेतीले समुद्र तट को दर्शाता है, जहाँ रेत और अन्य तलछट तटरेखा के समानांतर जमा हो गए हैं। लहरों और धाराओं द्वारा बहाकर लाई गई सामग्री के जमाव के कारण समुद्र तट बनता है, जो एक विस्तृत, सपाट और रेतीली सतह प्रदान करता है।
**Answer:****Answer:** Depositional work of sea waves.
**In simple words:** A beach is a landform consisting of loose particles like sand or pebbles, accumulated along the shoreline by the depositional action of sea waves.

🎯 Exam Tip: Beaches are prime examples of depositional landforms, formed where wave energy is reduced, allowing sediments to settle and accumulate along the coast.

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र एक सैंड बार को दर्शाता है, जो समुद्र तट से कुछ दूरी पर पानी में फैली हुई रेत की एक संकरी, लंबी पट्टी है। यह समुद्री धाराओं और लहरों द्वारा लाए गए तलछट के जमाव के कारण बनता है, जो तटरेखा के समानांतर एक बाधा के रूप में कार्य करता है।
**Answer:****Answer:** Depositional work of sea waves.
**In simple words:** A sand bar is a ridge of sand or other loose sediment deposited by currents and waves in a shallow area, often parallel to the coastline.

🎯 Exam Tip: Sand bars are significant depositional features, indicating the transport and accumulation of sediments by sea waves in shallow coastal environments.

**Question 5. See the pictures of the landforms produced by the work of groundwater. Write in the box below them whether they are formed through the work of erosion or deposition.**

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र एक सिंकहोल को दर्शाता है, जो जमीन में एक प्राकृतिक अवसाद या गड्ढा है। इसका निर्माण तब होता है जब भूमिगत जल (ग्राउंडवॉटर) घुलनशील आधारशिला, जैसे चूना पत्थर, को नष्ट कर देता है, जिससे सतह की मिट्टी या चट्टान नीचे धँस जाती है।
**Answer:****Answer:** Erosional work of ground water
**In simple words:** A sinkhole is a depression in the ground formed when groundwater dissolves soluble bedrock, causing the surface layer to collapse.

🎯 Exam Tip: Sinkholes are key indicators of groundwater erosion, especially in karst landscapes where soluble rocks like limestone are prevalent.

ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र एक गुफा के आंतरिक भाग को दर्शाता है, जिसमें छत से लटकती हुई स्टैलेक्टाइट्स और फर्श से ऊपर उठती हुई स्टैलेग्माइट्स दिखाई दे रही हैं। ये संरचनाएं भूमिगत जल द्वारा खनिजों के जमाव से बनती हैं, जो चूना पत्थर की गुफाओं में देखने को मिलती हैं।
**Answer:****Answer:** Depositional work of ground water
**In simple words:** Stalactites and stalagmites are formations in caves created by the deposition of minerals, primarily calcite, from dripping groundwater.

🎯 Exam Tip: Stalactites and stalagmites are classic examples of depositional landforms in caves, showing how mineral-rich groundwater leaves behind impressive structures.

Class 9 Geography Chapter 4 Exogenetic Movements Part 2 Intext Questions And Answers

**Question. Draw a diagram showing landforms at the sea coast:**
ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र समुद्र तट पर पाए जाने वाले विभिन्न भू-आकृतियों को दर्शाता है, जिसमें बाईं ओर से दाहिनी ओर तक समुद्री गुफा (Sea cave), वेव-कट प्लेटफॉर्म (Wave-cut platform), समुद्री कगार (Sea cliff), समुद्री मेहराब (Sea arch) और समुद्री ढेर (Sea stack) शामिल हैं। यह तटीय क्षेत्रों में समुद्री लहरों के कटाव और जमाव के परिणामस्वरूप बनने वाली विशेषताओं को स्पष्ट करता है।
**Answer:****Answer:** The diagram illustrates common landforms found at a sea coast, including: Sea cave, Wave-cut platform, Sea cliff, Sea arch, and Sea stack.
**In simple words:** This diagram visually represents various landforms like sea caves, cliffs, arches, and stacks, which are all shaped by the continuous interaction of sea waves with the coastline.

🎯 Exam Tip: Understanding the sequence and formation of these coastal landforms is crucial for describing the erosional and depositional work of sea waves.

Can You Tell?

**Question 1. How will you differentiate between a rill, gully, stream and a river?**
**Answer:****Answer:** The smallest natural flow of rain water is a rill. Many rills come together to form a gully. Many gullies come together and form a stream. Many streams come together and form a river. Thus we can see that rills, gullies, streams and rivers are the various forms of flowing water in increasing order of their size.
**In simple words:** Rills are tiny water flows, which combine to make gullies, then multiple gullies form streams, and finally, many streams merge to create a larger river.

🎯 Exam Tip: Focus on the increasing size and complexity of water flow channels to differentiate between these terms in an examination setting.

**Question 2. What is a river?**
**Answer:****Answer:** Running water flows naturally in a direction according to gravity along the slope, making its own way. This is called a flow of water when many such flows of water come together a river is formed.
**In simple words:** A river is a natural channel where many smaller water flows combine and move downhill due to gravity.

🎯 Exam Tip: A good definition of a river includes its natural flow, gravitational influence, and the confluence of smaller water bodies.

**Question 3. Where can you see the work by glaciers in India?**
**Answer:****Answer:** Glaciers can be seen in the Himalayan region in India.
**In simple words:** In India, glaciers are found primarily in the high-altitude Himalayan mountains.

🎯 Exam Tip: Remember the Himalayas as the primary location for glacial activity in India.

**Question 4. In which natural region can you see the work of glaciers at the sea level?**
**Answer:****Answer:** We can see the work of glacier at sea level in the Polar regions (Antarctica).
**In simple words:** Glacial activity at sea level is observed in the extremely cold Polar regions, like Antarctica.

🎯 Exam Tip: Associate sea-level glaciers with the frigid Polar regions, such as Antarctica, where temperatures are consistently below freezing.

**Question 5. Where will you find the landforms formed by sea waves along the Konkan coast?**
**Answer:****Answer:** Along the Konkan coast, landforms formed by sea waves can be found at Harihareshwar, Bhagwatibandar, Shrivardhan, Ratnagiri and Sindhudurg.
**In simple words:** Along India's Konkan coast, sea wave landforms are visible at places like Harihareshwar, Shrivardhan, and Ratnagiri.

🎯 Exam Tip: Listing specific locations like Harihareshwar and Ratnagiri demonstrates precise geographical knowledge of the Konkan coast.

Think About It.

**Question 1. There are many creeks found in the coastal areas of Konkan but no delta, why?**
**Answer:****Answer:** The Konkan coast has an indented (broken) coastline. Hence many creeks are found here. Many small seasonal rivers originate in the steep western side of the Western Ghats. As the rivers flow through the steep slopes their velocity increases. So, there is very little erosion done by them. Due to the narrow width of the Konkan coast, the rivers cover a short distance and drain in the Arabian sea. Thus they do not form estuaries rather than deltas.
**In simple words:** The Konkan coast has a broken shoreline and short, fast-flowing rivers from the Western Ghats that flow directly into the Arabian Sea, preventing delta formation and instead creating numerous creeks.

🎯 Exam Tip: The key factors for the absence of deltas on the Konkan coast are the steep slopes, short river courses, and the indented nature of the coastline, leading to creeks instead.

**Question 2. Can you see a glacier moving just as you can observe the movement of river water?**
**Answer:****Answer:** No
**In simple words:** No, glaciers move extremely slowly, making their movement imperceptible to the naked eye, unlike the visible flow of river water.

🎯 Exam Tip: Emphasize the solid state and extremely slow movement of glaciers as the reason why their motion is not readily observable.

**Question 3. Ramu has to dig a well in his farm. But he is in a dilemma as to which season should he dig it so that there is water supply for a longer time. What will you suggest to Ramu?**
**Answer:****Answer:** Ramu should dig a well during the summer season. A deep well can be dug during the summer season. This will ensure water supply not only during the monsoon and winter season but also during the next summer season.
**In simple words:** Ramu should dig his well in the summer because the groundwater level is lowest then, allowing him to dig deeper and secure water supply for all seasons.

🎯 Exam Tip: Advise digging wells during summer to reach the lowest groundwater table, ensuring sustained water availability throughout the year.

**Question 4. Which agent has more kinetic energy of all-wind, river or glacier?**
**Answer:****Answer:** Glacier is the agent of erosion which has the most kinetic energy of all. The glacier is a mixture of heavy soil and rock particles which are flowing. Thus it has both weight and movement.
**In simple words:** Glaciers possess the most kinetic energy because they are massive bodies of moving ice, containing embedded heavy soil and rocks, giving them immense weight and destructive power.

🎯 Exam Tip: Remember that a glacier's enormous mass, combined with its movement, gives it the highest kinetic energy among wind, rivers, and glaciers, leading to significant erosional capabilities.

Find Out.

**Question 1. Is there any lake found near the meanders of the river? Obtain information about them.**
**Answer:****Answer:**
• Ox-Bow lakes are usually found near the meanders of a river.
• Wherever the river changes its direction, erosion takes place along the outer banks.
• If these conditions occur again and again, the river develops a zigzag path.
• Such a zigzag path is called a meandering path (course) and each loop along the path is called meander.
• When the turns in the course become acute, the limbs of a turn come very close.
• During flood, as the force of water increases, the river skips the meandering path and follows a straight path.
• The abandoned portion of the loop develops into a lake that is called an 'ox-bow' lake.
**In simple words:** Yes, ox-bow lakes are formed near river meanders when a river's loop becomes very curved, gets cut off during a flood, and forms a separate crescent-shaped lake.

🎯 Exam Tip: An ox-bow lake is a distinct landform resulting from the natural process of river meander cutoff, often seen in mature river floodplains.

**Question 2. Where will you find mushroom rocks in the Deccan Plateau?**
**Answer:****Answer:** Mushroom rocks can be found in the Hyderabad.
**In simple words:** Mushroom rocks, formed by wind erosion, can be found in Hyderabad, specifically within the Deccan Plateau region.

🎯 Exam Tip: Hyderabad in the Deccan Plateau is a relevant location to associate with mushroom rock formations, which are sculpted by wind erosion.

**Question 3. Can you find the work of wind near coastal areas? What landforms will be formed there?**
**Answer:****Answer:** Yes, Ripple marks and sand mounds can be seen on the sand in the coastal regions.
**In simple words:** Yes, wind action is visible in coastal areas, forming ripple marks and sand mounds on the sandy surfaces.

🎯 Exam Tip: Wind's influence in coastal areas, though less dominant than sea waves, is evident in smaller features like ripple marks and sand mounds.

**Question 4. Where are limestone caves, stalactites and stalagmites found in Maharashtra?**
**Answer:****Answer:** Limestone caves, stalactites and stalagmites are found in Kanhur caves in the Ahmednagar district of Maharashtra.
**In simple words:** In Maharashtra, limestone caves with stalactites and stalagmites are found in the Kanhur caves located in the Ahmednagar district.

🎯 Exam Tip: Remember Kanhur caves in Ahmednagar district as an example of groundwater-formed landforms in Maharashtra.

**Question 5. Why are the landforms formed in limestone called Karst?**
**Answer:****Answer:** A karst is an area of land formation created by eroding and dissolving portions of limestone or other soluble rock layers above or below the ground. According to the prevalent interpretation, the term is derived from the German name for the Karst region, a limestone plateau above the city of Trieste in the northern Adriatic.
**In simple words:** Landforms developed in limestone regions are called Karst because the term originates from the Karst region, a limestone plateau near Trieste, where such unique geological features were first studied and defined.

🎯 Exam Tip: Connect the term "Karst" directly to the distinctive landscapes formed by the dissolution of soluble rocks like limestone, named after a specific geographical region.

Class 9 Geography Chapter 4 Exogenetic Movements Part 2 Additional Important Questions And Answers

Complete The Statements By Choosing The Correct Options.

**Question 1. The sediments are deposited at the foothills of the mountains in a triangular area forming an/a ...........**
(a) alluvial fan
(b) yardang
(c) delta
(d) V-shaped valley
**Answer:****Answer:** (a) alluvial fan
**In simple words:** Sediments deposited at mountain foothills often spread out in a triangular shape, forming an alluvial fan.

🎯 Exam Tip: An alluvial fan is a key depositional feature formed by rivers at the base of mountains where the slope suddenly decreases.

**Question 2. The sediments carried by the glacier are called ............**
(a) sediments
(b) silt
(c) moraines
(d) alluvium
**Answer:****Answer:** (c) moraines
**In simple words:** The rock and sediment debris transported by glaciers are specifically known as moraines.

🎯 Exam Tip: Remember 'moraines' as the unique term for glacial deposits, distinct from riverine sediments like alluvium or silt.

**Question 3. The erosional, transportation and depositional work of wind is more prominent in ............**
(a) polar regions
(b) deserts
(c) temperate regions
(d) grasslands
**Answer:****Answer:** (b) deserts
**In simple words:** Wind's work of erosion, transportation, and deposition is most active and noticeable in dry desert environments.

🎯 Exam Tip: Deserts are the primary regions where wind is a dominant agent of geomorphic change due to sparse vegetation and loose sediment.

**Question 4. When many flows of water come together a ............... is formed.**
(a) gorge
(b) river
(c) glacier
(d) canyon
**Answer:****Answer:** (b) river
**In simple words:** A river is formed when numerous smaller flows of water merge and combine into a single, larger channel.

🎯 Exam Tip: The formation of a river signifies the collection and organized flow of multiple water channels, distinguishing it from smaller streams or isolated flows.

**Question 5. The water which percolates through the porous rocks on the non-porous layer of rock is termed as ............**
(a) glacier
(b) flood leeves
(c) ground water
(d) surface water
**Answer:****Answer:** (c) ground water
**In simple words:** Water that seeps through permeable rocks and collects above an impermeable layer underground is known as groundwater.

🎯 Exam Tip: Ground water is crucial for understanding subterranean hydrological processes and is distinct from surface water or other landform-specific terms.

**Question 6. ............... is formed due to depositional work of river.**
(a) Delta
(b) Gorge
(c) V-shaped valley
(d) Canyon
**Answer:****Answer:** (a) Delta
**In simple words:** A delta is a landform created at the mouth of a river where its flow slows down, depositing sediments into a triangular shape.

🎯 Exam Tip: Deltas are characteristic depositional landforms of rivers, formed at their mouths where they meet a larger body of water and lose velocity.

**Question 7. In regions, where the temperatures are generally below freezing points, precipitation is in the form of ............**
(a) rainfall
(b) hail
(c) snowfall
(d) frost
**Answer:****Answer:** (c) snowfall
**In simple words:** In areas consistently below freezing, water vapor in the atmosphere precipitates as solid ice crystals, falling as snowfall.

🎯 Exam Tip: Snowfall is the direct form of precipitation in regions with temperatures persistently below the freezing point.

**Question 8. The erosional work of glacier forms ............**
(a) drumlins
(b) eskers
(c) cirques
(d) yardangs
**Answer:****Answer:** (c) cirques
**In simple words:** Glaciers erode mountainsides to carve out bowl-shaped depressions known as cirques.

🎯 Exam Tip: Cirques are primary erosional features formed by glaciers, typically found in mountainous terrains.

**Question 9. The Jacobshavn Glacier in ............ is one of the fastest moving glaciers in the world.**
(a) Finland
(b) Greenland
(c) Antarctica
(d) Himalayas
**Answer:****Answer:** (b) Greenland
**In simple words:** The Jacobshavn Glacier, known for its rapid movement, is located in Greenland.

🎯 Exam Tip: Associate the Jacobshavn Glacier with Greenland and its characteristic rapid movement, highlighting significant glacial dynamics.

**Question 10. The depositional work of ground water forms ............**
(a) limestone caves
(b) lagoons
(c) ripple marks
(d) seifs
**Answer:****Answer:** (a) limestone caves
**In simple words:** Groundwater's depositional work leads to the formation of structures like stalactites and stalagmites within limestone caves.

🎯 Exam Tip: Limestone caves, with their unique formations, are prime examples of landforms created by the dissolution and subsequent deposition by groundwater.

**Question 11. Stalactites grow ............**
(a) downwards
(b) upwards
(c) sidewards
(d) fast
**Answer:****Answer:** (a) downwards
**In simple words:** Stalactites grow downwards from the ceiling of caves as mineral-rich water drips and deposits material over time.

🎯 Exam Tip: Remember that stalactites 'hang tight' from the ceiling and grow downwards, whereas stalagmites grow upwards from the cave floor.

**Question 12. The ground water levels sink down in ............ season.**
(a) summer
(b) winter
(c) rainy
(d) spring
**Answer:****Answer:** (a) summer
**In simple words:** Groundwater levels typically decrease and sink deeper during the summer season due to increased evaporation and less rainfall.

🎯 Exam Tip: The lowest groundwater levels are usually observed in summer due to reduced recharge and higher demand, making it a critical season for water management.

**Question 13. ............... is formed as a result of the depositional work of the sea waves.**
(a) Sea cliff
(b) Lagoon
(c) Wave-cut platform
(d) Sea cave
**Answer:****Answer:** (b) Lagoon
**In simple words:** A lagoon is a body of water separated from the open sea by a sandbar or similar feature, formed through the deposition of sediments by sea waves.

🎯 Exam Tip: Lagoons are characteristic depositional features of sea waves, formed by sediment accumulation that creates a barrier isolating a water body.

**Question 14. The landforms developed in limestone areas are also called as ............ landforms.**
(a) lime
(b) sinkhole
(c) krast
(d) coastal
**Answer:****Answer:** (c) krast
**In simple words:** Landforms developed in limestone regions are collectively known as Karst landforms.

🎯 Exam Tip: The term 'Karst' is a specific geological classification for landscapes dominated by the dissolution of soluble bedrock, most commonly limestone.

Match The Columns:

**(1) River**

Column 'A'	Column 'B'
(1) Erosion	(a) Ox-bow lake
(2) Deposition	(b) Meanders
	(c) Yardangs

**Answer:****Answer:** (1 – b), (2-a)
**In simple words:** River erosion often leads to the formation of meanders, while river deposition can create ox-bow lakes from abandoned meander loops.

🎯 Exam Tip: Distinguish between erosional (meanders) and depositional (ox-bow lakes) features of rivers to accurately match them.

**(2) Glacier**

Column 'A'	Column 'B'
(1) Erosion	(a) Seif
(2) Deposition	(b) Eskers
	(c) Cirque

**Answer:****Answer:** (1 – c), (2 – b)
**In simple words:** Glacial erosion forms cirques, while glacial deposition creates eskers.

🎯 Exam Tip: Cirques are erosional features, and eskers are depositional features associated with glaciers. Seif is a wind-formed landform.

**(3) Wind**

Column 'A'	Column B'
(1) Erosion	(a) Sand dunes
(2) Deposition	(b) Mushroom Rock
	(c) Lagoon

**Answer:****Answer:** (1 – b), (2 - a)
**In simple words:** Wind erosion sculpts mushroom rocks, while wind deposition builds sand dunes.

🎯 Exam Tip: Mushroom rocks are unique erosional forms of wind, and sand dunes are common depositional features in arid regions.

**(4)**

Column 'A'	Column B'
(1) Ground water	(a) Delta region
(2) Sea waves	(b) Lagoon
	(c) Sink holes

**Answer:****Answer:** (1 - c), (2 – b)
**In simple words:** Groundwater activity leads to sinkholes, while sea waves are responsible for forming lagoons.

🎯 Exam Tip: Pair groundwater with sinkholes (dissolution) and sea waves with lagoons (deposition) for accurate matching.

**(5)**

Column 'A'	Column B'
(1) Stalactites & stalagmites	(a) wind
(2) Sand bar	(b) ground water
	(c) sea waves

**Answer:****Answer:** (1 – b), (2 - c)
**In simple words:** Stalactites and stalagmites are formed by groundwater, whereas sand bars are created by sea waves.

🎯 Exam Tip: Remember that cave formations like stalactites and stalagmites are products of groundwater, and sand bars are depositional features of sea waves.

Answer In One Sentence:

**Question 1. Name the agents of erosion.**
**Answer:****Answer:** The agents of erosion are wind, rivers, glaciers, sea waves and ground water.
**In simple words:** The main natural forces that cause erosion are wind, rivers, glaciers, sea waves, and groundwater.

🎯 Exam Tip: Listing all five major agents of erosion is fundamental knowledge in physical geography.

**Question 2. What factors does the work of a river depend on?**
**Answer:****Answer:** The works of river depends on the nature of rock, the slope of land, velocity of the flow and the volume of water.
**In simple words:** A river's work depends on the type of rock, land slope, flow speed, and the amount of water it carries.

🎯 Exam Tip: Key factors influencing river work include rock type (resistance), gradient (slope), flow speed (energy), and water volume (capacity).

**Question 3. What are the important phases of a river's work?**
**Answer:****Answer:** The important phases of a river's work are erosion, transportation and deposition.
**In simple words:** The three main stages of a river's action are eroding material, moving it downstream, and finally depositing it.

🎯 Exam Tip: The three phases-erosion, transportation, and deposition-are universal to most geomorphic agents, not just rivers.

**Question 4. What factors does the work of glaciers depend on?**
**Answer:****Answer:** The work of glacier depends on the thickness of the accumulated ice, the temperature, and the slope of the land.
**In simple words:** A glacier's work is influenced by how thick its ice is, the surrounding temperature, and the steepness of the land it moves over.

🎯 Exam Tip: Glacial activity is primarily governed by ice volume (thickness), thermal conditions (temperature affecting melting/freezing), and topography (slope driving movement).

**Question 5. Which landforms are created due to the processes of erosion by the river?**
**Answer:****Answer:** Landforms like gorges, V-shaped valleys, potholes and waterfalls are created due to the processes of erosion by the river.
**In simple words:** River erosion forms gorges, V-shaped valleys, potholes, and waterfalls.

🎯 Exam Tip: Focus on the cutting and downcutting action of rivers to identify erosional landforms like gorges and V-shaped valleys.

**Question 6. Which landforms are formed mainly due to the transportational and depositional work of a river?**
**Answer:****Answer:** Due to the transportational and depositional work of a river, meanders, ox-bow lakes, flood levees, flood plains and delta regions are formed.
**In simple words:** River transportation and deposition create meanders, ox-bow lakes, flood levees, flood plains, and deltas.

🎯 Exam Tip: Distinguish between erosional (e.g., V-shaped valley) and depositional (e.g., delta, flood plain) features when discussing river work.

**Question 7. Which landforms are created as a result of the erosional work of a glacier?**
**Answer:****Answer:** The landforms such as a cirque, arete and matterhorn, U-shaped valley, hanging valleys, etc. are created as a result of the erosional work of a glacier.
**In simple words:** Glacial erosion forms cirques, arêtes, matterhorns, U-shaped valleys, and hanging valleys.

🎯 Exam Tip: Common erosional landforms of glaciers include cirques (bowl-shaped hollows), U-shaped valleys (trough-like), and sharp ridges like arêtes.

**Question 8. Name the landforms formed by the depositional work of glaciers.**
**Answer:****Answer:** The landforms formed by the depositional work of glaciers are drumlins, eskers etc.
**In simple words:** Glaciers deposit material to create landforms like drumlins and eskers.

🎯 Exam Tip: Drumlins (elongated hills) and eskers (winding ridges) are distinctive depositional features of glaciated landscapes.

**Question 9. Name the types of moraine.**
**Answer:****Answer:** Ground moraine, lateral moraine, medial moraine and terminal moraine are the different types of moraine.
**In simple words:** The main types of moraines are ground, lateral, medial, and terminal, classified by their position relative to the glacier.

🎯 Exam Tip: Knowing the different types of moraines helps in understanding the varying patterns of glacial deposition.

**Question 10. Which landforms are created as a result of the erosional work of the wind?**
**Answer:****Answer:** The landforms like mushroom rocks, deflation hollows, yardangs etc. are created as a result of the erosional work of the wind.
**In simple words:** Wind erosion creates landforms such as mushroom rocks, deflation hollows, and yardangs.

🎯 Exam Tip: Mushroom rocks and yardangs are key examples of differential erosion by wind, while deflation hollows result from the removal of fine particles.

**Question 11. Which landforms are created as a result of the transportation and depositional work of the wind?**
**Answer:****Answer:** Sand dunes, barchans, seif, ripple marks, and loess plains are created as a result of transportation and depositional work of the wind.
**In simple words:** Wind's transport and deposition create sand dunes, barchans, seifs, ripple marks, and loess plains.

🎯 Exam Tip: Focus on features like sand dunes (including barchans and seifs) and loess plains as the main depositional landforms of wind.

**Question 12. Which landforms are produced as a result of the erosional work of sea waves?**
**Answer:****Answer:** The landforms like sea cliffs, sea caves, wave-cut platforms, sea arches and sea stacks are produced as a result of the erosional work of sea waves.
**In simple words:** Sea wave erosion creates sea cliffs, sea caves, wave-cut platforms, sea arches, and sea stacks.

🎯 Exam Tip: Remember these landforms as classic examples of how sea waves shape coastlines through their powerful erosive action.

**Question 13. Mention the landforms created due to the transportation and depositional work of sea waves.**
**Answer:****Answer:** Beaches, sand bars and lagoons are created due to the transportation and depositional work of sea waves.
**In simple words:** Sea wave transport and deposition result in landforms such as beaches, sand bars, and lagoons.

🎯 Exam Tip: Beaches, sand bars, and lagoons are prime examples of how sea waves accumulate and reshape sediments along coastlines.

**Question. Fill the map with the given information and make a legend.**
(1) Konkan Coast where work of sea waves can be seen
(2) Region in India where work of glaciers can be seen
(3) Desert region in India where work of wind can be seen
**Answer:****Answer:**
ℹ️ चित्र व्याख्या (Diagram Explanation): यह भारत का एक राजनीतिक मानचित्र है जिसमें तीन अलग-अलग क्षेत्रों को चिह्नित किया गया है: (1) कोंकण तट, जहाँ समुद्री लहरों का कार्य देखा जा सकता है (पश्चिम में तटीय पट्टी); (2) भारत में वह क्षेत्र जहाँ ग्लेशियरों का कार्य देखा जा सकता है (उत्तर में हिमालयी क्षेत्र); और (3) भारत में रेगिस्तानी क्षेत्र जहाँ हवा का कार्य देखा जा सकता है (उत्तर-पश्चिम में थार रेगिस्तान)। यह मानचित्र विभिन्न भू-आकृतिक एजेंटों के क्षेत्रीय वितरण को दर्शाता है।
**In simple words:** The map of India indicates three key geographical regions: the Konkan coast for sea wave activity, the Himalayan region for glaciers, and the North-Western desert for wind's work.

🎯 Exam Tip: For map-based questions, accurately locating the specified regions for each geomorphic agent (Konkan coast, Himalayas, Desert) is essential for full marks.

Give Geographical Reasons:

**Question 1. Like the river, a glacier too carries out the work of erosion, transportation and deposition.**
**Answer:****Answer:**
• In regions, where the temperatures are generally below freezing points, precipitation is in the form of snowfall.
• Layers of snow accumulate on the earth's surface because of snowfall.
• The heavy weight of these overlying layers makes the snow move along the slope.
• At the base of the layer, the snow starts melting because of the friction and the pressure from above. Glacier starts moving slowly along the slope.
• Thus like the river, a glacier too carries out the work of erosion, transportation and deposition.
**In simple words:** Glaciers, formed by accumulated snow and ice, move downslope due to their immense weight and friction-induced melting, causing them to erode, transport, and deposit material, much like rivers.

🎯 Exam Tip: The key to explaining glacial work is to highlight its solid yet flowing nature, driven by gravity and immense weight, enabling it to perform erosion, transport, and deposition over long periods.

**Question 2. Specific landforms are formed due to deposition by wind in arid and semi arid regions.**
**Answer:****Answer:**
• Sand particles that blow with the winds are of different shapes and sizes.
• Those particles which are very fine are carried to larger distances while the larger ones get transported to shorter distances only.
• These sand particles get deposited in deserts and semi-arid climates.
• As a result, specific landforms are formed.
• Sand dunes, barchans, seifs, ripple marks, loess plains, etc. are formed by deposition by wind.
**In simple words:** Wind in arid and semi-arid regions sorts and deposits sand particles based on size, creating distinct landforms like sand dunes, barchans, and ripple marks, because of sparse vegetation and abundant loose sediment.

🎯 Exam Tip: The effectiveness of wind as a depositional agent in arid regions is due to the lack of vegetation, abundance of loose sediment, and the differential transport of particles by size.

**Question 3. The work of sea waves cause different landforms.**
**Answer:****Answer:**
• In coastal areas, the sea waves carry out erosional, depositional and transportational work.
• Winds and tides cause the movements of sea water. As a result, waves come to the coast.
• Because of their hitting the rocks at the coasts, erosion of the rocks occurs.
• The landforms like wave-cut platforms, sea caves, sea arches, sea cliffs, etc. are formed because of the erosional work of the waves.
• The landforms like beaches, sand bar, lagoons are formed due to depositional work of the sea waves.
**In simple words:** Sea waves constantly interact with coastlines, using their energy, along with winds and tides, to erode rocky shores into features like cliffs and arches, and to deposit sediments forming beaches and lagoons, thus creating diverse landforms.

🎯 Exam Tip: When explaining the work of sea waves, remember to include all three aspects-erosion, transportation, and deposition-and provide examples of landforms for each process.

**Question 4. In the desert, the work of wind is effective.**
**Answer:****Answer:**
• The work of wind is predominantly found in the hot desert and semi-arid regions.
• Hot deserts are found close to the Tropic of Cancer and Tropic of Capricorn.
• The average annual rainfall in the hot deserts is 250 mm or even less. Therefore, the vegetal cover is negligible.
• As there are no obstacles due to lack of vegetal cover, the work of wind is effective in the desert.
**In simple words:** Wind is highly effective in deserts due to minimal rainfall, leading to sparse vegetation, which removes natural obstacles and allows wind to freely erode, transport, and deposit sand and dust.

🎯 Exam Tip: The lack of vegetation and the abundance of loose, dry sediment are the primary reasons for the significant geomorphic work of wind in desert environments.

**Question 5. Glaciers have a low velocity.**
**Answer:****Answer:**
• In the high altitude areas and the areas of high elevation, the ice slides down the slope. Such a sliding mass of ice is called a glacier.
• As the ice moving in a glacier is in the solid state, its velocity is very low.
• The thickness of the accumulated ice, the temperature and the slope of the land are the factors that determine the velocity of the glacier.
**In simple words:** Glaciers move slowly because they are made of solid ice, and while their immense mass allows movement down slopes, the internal friction and solid state restrict their speed compared to liquid water.

🎯 Exam Tip: The solid state of ice is the fundamental reason for a glacier's low velocity, despite its massive size and gravitational pull.

**Question 6. The ground water level changes according to seasons.**
**Answer:****Answer:**
• The upper level of the stored ground water is called ground water level.
• It varies according to the slope of the land, porosity and compactness of the rocks and the rainfall in the region.
• Ground water level also changes according to season.
• In the rainy season, it is closer to the ground surface whereas during summer, it drops down deeper.
**In simple words:** Groundwater levels fluctuate seasonally because they are recharged by rainfall, causing them to be higher in the rainy season and lower in drier periods like summer due to less replenishment and increased usage.

🎯 Exam Tip: Ground water level changes are primarily linked to the balance between recharge (rainfall) and discharge (evaporation, usage), making seasonal variation a crucial aspect.

**Question. Identify the land forms made by waves and write their names in the given picture.**
ℹ️ चित्र व्याख्या (Diagram Explanation): यह एक रेखाचित्र है जो समुद्र तट पर विभिन्न भू-आकृतियों को दर्शाता है, जहाँ समुद्री लहरों की क्रिया स्पष्ट रूप से दिखाई देती है। इसमें समुद्री गुफाएँ, वेव-कट प्लेटफॉर्म, समुद्री मेहराब, समुद्री ढेर, कगार, लैगून और समुद्र तट जैसी संरचनाएँ शामिल हैं, जो तटीय भू-आकृतियों के विकास को स्पष्ट करती हैं। चित्र में संख्याएँ 1 से 7 तक अलग-अलग भू-आकृतियों को इंगित करती हैं।
**Answer:****Answer:**
• Wave-cut platform
• Lagoon
• Beach
• Sea cave
• Sea arch
• Sea stack
• Sea cliff
**In simple words:** The image displays various coastal landforms shaped by waves, including wave-cut platforms, lagoons, beaches, sea caves, sea arches, sea stacks, and sea cliffs.

🎯 Exam Tip: Accurately identifying a range of erosional and depositional landforms (e.g., caves, platforms, beaches, lagoons) is crucial for a comprehensive understanding of wave action.

**Question. Write the name of the landforms with which the following diagrams are associated. Colour the eroded and the remaining part, if any, in the given diagrams.**
ℹ️ चित्र व्याख्या (Diagram Explanation): यह अनुक्रम चार रेखाचित्रों को दर्शाता है, जो हवा के कटाव और जमाव से बनी विभिन्न भू-आकृतियों का प्रतिनिधित्व करते हैं। पहले चित्र में एक मशरूम रॉक, दूसरे में एक सैंड ड्यून (बार्चान), तीसरे में यारडैंग्स और चौथे में एक सेफ (सैंड माउंट) दिखाया गया है। ये चित्र हवा द्वारा चट्टानों के आकार को बदलने और रेत के जमाव की प्रक्रिया को दर्शाते हैं।
**Answer:****Answer:**
(a) Mushroom Rock
(b) Sand Dune (Barchan)
(c) Yardangs
(d) Seif (Sand Mounds)
**In simple words:** These diagrams illustrate various wind-formed landforms: (a) Mushroom Rock, (b) Sand Dune (Barchan), (c) Yardangs, and (d) Seif (Sand Mounds).

🎯 Exam Tip: Be able to visually identify these distinct landforms (Mushroom Rock, Sand Dune, Yardangs, Seif) and link them to the erosional and depositional work of wind.

**Question. Identify the landforms formed by groundwater in the given diagram.**
ℹ️ चित्र व्याख्या (Diagram Explanation): यह रेखाचित्र एक भूमिगत गुफा को दर्शाता है, जिसमें छत से लटकती हुई स्टैलेक्टाइट और फर्श से ऊपर उठती हुई स्टैलेग्माइट संरचनाएं दिखाई दे रही हैं, साथ ही गुफा की मेहराबदार छत और दीवारों की संरचना भी स्पष्ट है। यह चित्र चूना पत्थर क्षेत्रों में भूमिगत जल के रासायनिक कटाव और खनिजों के जमाव से बनने वाली भू-आकृतियों को स्पष्ट करता है।
**Answer:****Answer:** Stalactite and Stalagmite cave.
**In simple words:** The diagram shows a cave with stalactites hanging from the ceiling and stalagmites rising from the floor, both formed by groundwater.

🎯 Exam Tip: The presence of both stalactites and stalagmites is a definitive indicator of a cave formed by the depositional work of groundwater.

Answer The Following Questions In Brief:

**Question 1. List the agents responsible for new landforms. i**
**Answer:****Answer:** The agents - running water (river), glaciers, wind, sea waves and groundwater, – do the work of erosion, transportation and deposition. Because of these agents, the earth's surface keeps undergoing changes and new landforms are formed.
**(i) Running water (river):**
• The river beds, as well as the banks of a river, are eroded due to the speedy flowing stream of water. The load that a river carries also erodes the banks and the bed of the river.
• The rocks, stones, sand, etc. collide with one another and break into fragments
• Different landforms like gorge, V-shaped valley, pothole and waterfall are formed due to the erosional work of a river.
**(ii) Glaciers:**
• As a glacier is nothing but a solid mass of ice, its velocity is very low. Nevertheless, the mass of water in the solid form is quite high. Therefore, glaciers cause a considerable amount of erosion.
• The glaciers erode the ice-clad base of the mountain slopes and the snow-clad sides of the mountains to a large extent.
• The Cirque, Arete and horn, U-Shaped valley and hanging valley are the landforms formed by the erosional work of a glacier.
**In simple words:** The main agents shaping new landforms are rivers, glaciers, wind, sea waves, and groundwater, which continuously cause erosion, transport, and deposition across the Earth's surface.

🎯 Exam Tip: For a comprehensive answer, list all five agents and briefly explain their general erosional mechanisms and resultant landforms.

**(iii) Wind:**
• The wind carries sand and pebbles.
• When they strike and scratch the rocks, the elevated and basal parts of the rocks get eroded.
• Due to the erosional processes of the wind, deflation hollows, mushroom rocks and yardangs are formed.
**(iv) Sea waves:**
• The basal portions of the headlands get severely eroded due to the continuous attack of sea waves. This leads to the erosion of the rocks on a large scale.
• Rocky coasts are formed where the headlands get severely eroded.
• Landforms such as sea cliffs, sea caves, wave-cut platforms, sea arches and sea stacks are formed due to the erosional work of sea waves.
**(v) Groundwater:**
• Soluble minerals in the rocks dissolve in water and they move along with the ground water. This process is called erosion by ground water.
• The work of ground water is predominant in the region where rock like limestone is found on a large scale.
• Limestone dissolves in carbonic acid. Carbonic acid is formed due to the presence of carbon? dioxide in ground water. This acid dissolves carbonates like limestone. Thus, chemical weathering takes place.
• The landforms like sinkholes and caves are the result of the erosional work of groundwater.
**In simple words:** Wind erodes by carrying abrasive particles, sea waves erode coastlines through continuous impact, and groundwater erodes by dissolving soluble rocks like limestone, each creating distinct landforms.

🎯 Exam Tip: When describing each agent, link their unique mechanisms (e.g., wind abrasion, wave impact, groundwater dissolution) to the specific erosional landforms they create.

**Question 2. List the landforms that are produced due to deposition of sediments by rivers.**
**Answer:****Answer:** Landforms like flood levees, flood plains, deltas are formed because of deposition of sediments,
1. Flood levees: When in flood, the river deposits; the coarser material on the banks which in duecourse rises parallel to the banks of the river. These are called 'flood levees'.
2. Flood plains: The finer silt deposited away from the banks during the flood form plains on ! either side of the river. They are called 'flood plains'.
3. Delta: The continuous deposition leads to the formation of a plain in the shape of a triangle called delta. Extensive deltas have been formed! at the mouth of rivers Ganga, Godavari, Kaveri.
**In simple words:** Rivers deposit sediments to create landforms such as flood levees, flood plains, and deltas, especially when the river's speed decreases or it overflows its banks.

🎯 Exam Tip: Focus on how a decrease in river velocity and energy leads to the dropping of sediments, forming these characteristic depositional landforms.

**Question 3. Write in detail about the erosional and depositional work of wind.**
**Answer:****Answer:**
**(i) Erosional work of winds:**
• Wind carries small sand particles, small pebbles, etc. along with it.
• These particles cause erosion along rocks coming in the way due to friction.
• This leads to formation of mushroom rocks, deflation hollows, yardangs, etc.
**(ii) Depositional work of winds:**
• Sand particles that blow with the winds are of different shapes and sizes.
• Those particles which are very fine are carried to larger distances while the larger ones get transported to shorter distances only.
• These sand particles get deposited in deserts and semi-arid climates. As a result, specific landforms are formed.
• Sand dunes, barchans, seifs, ripple marks, loessplains, etc. are formed by deposition by wind.
**In simple words:** Wind erodes by carrying abrasive particles that sculpt rocks into features like mushroom rocks and yardangs, while its depositional work creates landforms such as sand dunes, barchans, and loess plains as its speed reduces.

🎯 Exam Tip: Clearly distinguish between wind's erosional processes (abrasion, deflation) and depositional processes, and provide specific landform examples for each.

**Question 4. Write in detail about the erosional and depositional work of sea waves.**
**Answer:****Answer:**
**(i) Erosional work of sea waves:**
• When the waves break at the coast, they bring with them water, transported stones, pebbles, sand particles, etc. This leads to the erosion of the coast.
• Because of the chemical and hydraulic action of the sea wave too, the erosion occurs. The landforms like wavecut platforms, sea caves, sea arches, sea cliffs, etc. are formed because of the erosional work of the waves.
**In simple words:** Sea waves erode coastlines through hydraulic action and abrasion, carrying sediments that carve out features like wave-cut platforms, sea caves, sea arches, and sea cliffs.

🎯 Exam Tip: When describing sea wave erosion, emphasize the combined mechanical (hydraulic action, abrasion) and chemical processes that lead to distinct coastal landforms.

 

Question 4. What factors does the work of glaciers depend on?
Answer: The work of glacier depends on the thickness of the accumulated ice, the temperature, and the slope of the land.
In simple words: A glacier's activity, including its erosion, depends on how thick the ice is, the surrounding temperature, and the steepness of the ground it rests upon.

🎯 Exam Tip: When describing factors affecting glacier work, focus on the physical properties like ice thickness, temperature, and terrain slope, as these are key determinants.

 

Question 5. Which landforms are created due to the processes of erosion by the river?
Answer: Landforms like gorges, V-shaped valleys, potholes and waterfalls are created due to the processes of erosion by the river.
In simple words: Rivers, through their powerful flow, carve out deep valleys, narrow gorges, circular potholes, and dramatic waterfalls.

🎯 Exam Tip: Remember to clearly distinguish between erosional and depositional landforms. For rivers, gorges and V-shaped valleys are classic examples of erosion.

 

Question 6. Which landforms are formed mainly due to the transportational and depositional work of a river?
Answer: Due to the transportational and depositional work of a river, meanders, ox-bow lakes, flood levees, flood plains and delta regions are formed.
In simple words: As rivers slow down and carry sediment, they create winding curves (meanders), cutoff lakes (ox-bows), raised riverbanks (flood levees), flat areas next to the river (flood plains), and triangular landforms at their mouth (deltas).

🎯 Exam Tip: Focus on identifying landforms that are created when a river's energy decreases, leading to the dropping of transported material. Meanders and deltas are prime examples of this combined work.

 

Question 7. Which landforms are created as a result of the erosional work of a glacier?
Answer: The landforms such as a cirque, arete and matterhorn, U-shaped valley, hanging valleys, etc. are created as a result of the erosional work of a glacier.
In simple words: Glaciers, as they move, sculpt the landscape to form bowl-shaped hollows (cirques), sharp ridges (aretes), pyramid-like peaks (matterhorns), wide U-shaped valleys, and elevated tributary valleys (hanging valleys).

🎯 Exam Tip: When listing glacial erosional features, remember the characteristic U-shape of valleys and the sharp, angular features like cirques and horns.

 

Question 8. Name the landforms formed by the depositional work of glaciers.
Answer: The landforms formed by the depositional work of glaciers are drumlins, eskers etc.
In simple words: When glaciers melt and retreat, they leave behind mounds of till known as drumlins, and long, winding ridges of sand and gravel called eskers.

🎯 Exam Tip: Distinguish between features formed by glacial erosion (e.g., U-shaped valleys) and those formed by deposition (e.g., drumlins, eskers).

 

Question 9. Name the types of moraine.
Answer: Ground moraine, lateral moraine, medial moraine and terminal moraine are the different types of moraine.
In simple words: Moraines are accumulations of rock and sediment carried and deposited by glaciers, classified by their location: on the ground (ground), along the sides (lateral), in the middle (medial), or at the end (terminal).

🎯 Exam Tip: Understanding the different types of moraines helps in visualizing the various ways glaciers transport and deposit sediment, often named by their position relative to the glacier.

 

Question 10. Which landforms are created as a result of the erosional work of the wind?
Answer: The landforms like mushroom rocks, deflation hollows, yardangs etc. are created as a result of the erosional work of the wind.
In simple words: Wind, especially in dry areas, erodes rocks to form unique shapes like mushroom-shaped rocks, depressions called deflation hollows, and elongated ridges known as yardangs.

🎯 Exam Tip: Focus on the abrasive and deflationary actions of wind in arid regions, leading to distinct rock formations and depressions.

 

Question 11. Which landforms are created as a result of the transportation and depositional work of the wind?
Answer: Sand dunes, barchans, seif, ripple marks, and loess plains are created as a result of transportation and depositional work of the wind.
In simple words: Wind carries and drops sand and dust, forming various features like hills of sand (sand dunes, barchans, seifs), small ridges on sand (ripple marks), and vast plains of fine silt (loess plains).

🎯 Exam Tip: Remember that wind's depositional work primarily results in sand formations (dunes, ripple marks) and the accumulation of fine dust over large areas (loess).

 

Question 12. Which landforms are produced as a result of the erosional work of sea waves?
Answer: The landforms like sea cliffs, sea caves, wave-cut platforms, sea arches and sea stacks are produced as a result of the erosional work of sea waves.
In simple words: Powerful sea waves constantly crash against coasts, eroding rock to form steep coastal cliffs, hollowed-out sea caves, flat platforms at sea level, arch-shaped openings, and isolated pillars of rock (sea stacks).

🎯 Exam Tip: When discussing sea wave erosion, visualize the impact of waves on rocky coasts, leading to features that reveal the direct cutting and shaping action of water.

 

Question 13. Mention the landforms created due to the transportation and depositional work of sea waves.
Answer: Beaches, sand bars and lagoons are created due to the transportation and depositional work of sea waves.
In simple words: Sea waves transport sediments and deposit them along the coast, forming sandy shorelines (beaches), underwater ridges of sand (sand bars), and shallow bodies of water separated from the sea (lagoons).

🎯 Exam Tip: For sea wave deposition, think of features where sediment accumulates, such as a beach where sand is laid down, or sand bars that separate lagoons from the open sea.

Fill The Map With The Given Information And Make A Legend.
(1) Konkan Coast where work of sea waves can be seen
(2) Region in India where work of glaciers can be seen
(3) Desert region in India where work of wind can be seen

 

ℹ️ चित्र व्याख्या (Diagram Explanation): यह भारत का राजनीतिक मानचित्र है जिसमें विभिन्न भौगोलिक क्षेत्रों को संख्या (1, 2, 3) और पैटर्न के साथ दर्शाया गया है। इसमें एक सूचकांक भी शामिल है जो इन संख्याओं को क्रमशः कोंकण तट पर समुद्री लहरों के कार्य, भारत में ग्लेशियरों के कार्य के क्षेत्र और भारत में रेगिस्तानी क्षेत्र में पवन के कार्य से जोड़ता है।

In simple words: The diagram is a political map of India showing regions where sea wave, glacier, and wind erosion/deposition are prominent, indicated by numbered and patterned areas with a corresponding legend.

🎯 Exam Tip: For map-based questions, accurately locate the specified regions and ensure the legend clearly matches the symbols or numbering on the map for full marks.

Give Geographical Reasons:

 

Question 1. Like the river, a glacier too carries out the work of erosion, transportation and deposition.
Answer:

• In regions, where the temperatures are generally below freezing points, precipitation is in the form of snowfall.
• Layers of snow accumulate on the earth's surface because of snowfall.
• The heavy weight of these overlying layers makes the snow move along the slope.
• At the base of the layer, the snow starts melting because of the friction and the pressure from above. Glacier starts moving slowly along the slope.
• Thus like the river, a glacier too carries out the work of erosion, transportation and deposition.

In simple words: Glaciers, formed by accumulating snow, move slowly downhill due to their immense weight and a thin layer of meltwater at their base. This movement allows them to scrape, carry, and drop rock and sediment, performing erosion, transportation, and deposition similar to a river.

🎯 Exam Tip: Highlight the key mechanisms: accumulation of snow, immense weight causing movement, friction/pressure leading to basal melting, and the slow but powerful movement that enables all three geological processes.

 

Question 2. Specific landforms are formed due to deposition by wind in arid and semi-arid regions.
Answer:

• Sand particles that blow with the winds are of different shapes and sizes.
• Those particles which are very fine are carried to larger distances while the larger ones get transported to shorter distances only.
• These sand particles get deposited in deserts and semi-arid climates.
• As a result, specific landforms are formed.
• Sand dunes, barchans, seifs, ripple marks, loess plains, etc. are formed by deposition by wind.

In simple words: In dry areas, wind picks up and carries sand and dust. Finer particles travel further, while heavier ones are dropped closer, leading to the formation of characteristic features like sand dunes, ripples, and loess plains as the wind loses energy.

🎯 Exam Tip: Emphasize the role of particle size and wind energy in determining deposition patterns, which in turn dictate the specific landforms created, such as various types of sand dunes.

 

Question 3. The work of sea waves cause different landforms.
Answer:

• In coastal areas, the sea waves carry out erosional, depositional and transportational work.
• Winds and tides cause the movements of sea water. As a result, waves come to the coast.
• Because of their hitting the rocks at the coasts, erosion of the rocks occurs.
• The landforms like wave-cut platforms, sea caves, sea arches, sea cliffs, etc. are formed because of the erosional work of the waves.
• The landforms like beaches, sand bar, lagoons are formed due to depositional work of the sea waves.

In simple words: Sea waves constantly interact with coastlines, eroding some areas to create cliffs and caves, while depositing sediment in others to form beaches and sand bars, thus shaping a variety of coastal landforms.

🎯 Exam Tip: Explain how sea waves engage in all three processes-erosion, transportation, and deposition-leading to a diverse set of landforms unique to coastal environments.

 

Question 4. In the desert, the work of wind is effective.
Answer:

• The work of wind is predominantly found in the hot desert and semi-arid regions.
• Hot deserts are found close to the Tropic of Cancer and Tropic of Capricorn.
• The average annual rainfall in the hot deserts is 250 mm or even less. Therefore, the vegetal cover is negligible.
• As there are no obstacles due to lack of vegetal cover, the work of wind is effective in the desert.

In simple words: Wind is a very strong force in deserts because there is little rainfall, which means sparse plant cover. Without plants to hold the soil and block the wind, the wind can easily pick up and move sand and dust, effectively shaping the landscape.

🎯 Exam Tip: Connect the lack of vegetation (due to low rainfall) in deserts to the absence of obstructions, which allows wind to perform significant erosional and depositional work.

 

Question 5. Glaciers have a low velocity.
Answer:

• In the high altitude areas and the areas of high elevation, the ice slides down the slope. Such a sliding mass of ice is called a glacier.
• As the ice moving in a glacier is in the solid state, its velocity is very low.
• The thickness of the accumulated ice, the temperature and the slope of the land are the factors that determine the velocity of the glacier.

In simple words: Glaciers, being massive bodies of solid ice, move very slowly down slopes due to their immense weight. Their velocity is low because they are not liquid, and factors like ice thickness, temperature, and land slope influence just how slow they are.

🎯 Exam Tip: The key reason for low velocity is the solid state of ice. Mentioning the factors influencing this slow movement (thickness, temperature, slope) adds depth to the answer.

 

Question 6. The ground water level changes according to seasons.
Answer:

• The upper level of the stored ground water is called ground water level.
• It varies according to the slope of the land, porosity and compactness of the rocks and the rainfall in the region.
• Ground water level also changes according to season.
• In the rainy season, it is closer to the ground surface whereas during summer, it drops down deeper.

In simple words: The groundwater level, or water table, fluctuates with the seasons. It rises closer to the surface during rainy periods due to increased infiltration, and it drops deeper during dry summer months as water is used up and less is replenished.

🎯 Exam Tip: Explain the direct correlation between rainfall/precipitation and the replenishment of groundwater, and conversely, the drop in water level during dry seasons due to usage and lack of recharge.

 

Identify the land forms made by waves and write their names in the given picture.
ℹ️ चित्र व्याख्या (Diagram Explanation): यह एक तटीय भूदृश्य का रेखाचित्र है जो समुद्री लहरों द्वारा निर्मित विभिन्न भू-आकृतियों को दर्शाता है। इसमें एक तटीय रेखा के किनारे लहर-कटे हुए मंच, लैगून, समुद्र तट, समुद्री गुफा, समुद्री चाप, समुद्री ढेर और समुद्री चट्टान जैसे विशिष्ट तत्वों को क्रमांकित किया गया है।

Answer:

• Wave-cut platform
• Lagoon
• Beach
• Sea cave
• Sea arch
• Sea stack
• Sea cliff

In simple words: The diagram illustrates various coastal features formed by sea waves, including platforms, lagoons, beaches, caves, arches, stacks, and cliffs, showing both erosional and depositional landforms.

🎯 Exam Tip: For diagrams of landforms, it's crucial to correctly identify each feature based on its characteristic shape and position, distinguishing between features formed by erosion and those by deposition.

Write the name of the landforms with which the following diagrams are associated. Colour the eroded and the remaining part, if any, in the given diagrams.

 

ℹ️ चित्र व्याख्या (Diagram Explanation): इस पृष्ठ में पवन द्वारा निर्मित विभिन्न भू-आकृतियों को दर्शाने वाले चार अलग-अलग रेखाचित्र (स्केच) हैं। वे एक मशरूम चट्टान, एक रेत का टीला (बरचान), यार्डंग्स और सेफ (रेत के टीले) को दर्शाते हैं, जो पवन के कटाव और निक्षेपण कार्य को चित्रित करते हैं।

Answer:
(a) Mushroom Rock
(b) Sand Dune (Barchan)
(c) Yardangs
(d) Seif (Sand Mounds)

In simple words: The diagrams show landforms shaped by wind: a mushroom-shaped rock (erosion), a crescent-shaped sand dune (barchan, deposition), elongated ridges (yardangs, erosion), and linear sand mounds (seif, deposition).

🎯 Exam Tip: When presented with diagrams of landforms, ensure you can identify the specific feature and correctly attribute it to the geological agent (like wind) and process (erosion or deposition) responsible for its formation.

 

Identify the landforms formed by groundwater in the given diagram.
ℹ️ चित्र व्याख्या (Diagram Explanation): यह एक गुफा का आरेख है जिसमें भूजल द्वारा निर्मित भू-आकृतियों, जैसे ऊपर से लटकती हुई स्टैलेक्टाइट्स और नीचे से बढ़ती हुई स्टैलेग्माइट्स को दर्शाया गया है।

Answer: Stalactite and Stalagmite cave.
In simple words: The diagram shows the interior of a cave with icicle-like formations hanging from the ceiling (stalactites) and growing upwards from the floor (stalagmites), both formed by groundwater deposition.

🎯 Exam Tip: For diagrams involving groundwater, correctly identify stalactites (hanging from the ceiling) and stalagmites (rising from the floor), understanding that they are formed by mineral deposition from dripping water.

Answer The Following Questions In Brief:

 

Question 1. List the agents responsible for new landforms. i
Answer: The agents - running water (river), glaciers, wind, sea waves and groundwater, – do the work of erosion, transportation and deposition. Because of these agents, the earth's surface keeps undergoing changes and new landforms are formed.
(i) Running water (river):

• The river beds, as well as the banks of a river, are eroded due to the speedy flowing stream of water. The load that a river carries also erodes the banks and the bed of the river.
• The rocks, stones, sand, etc. collide with one another and break into fragments
• Different landforms like gorge, V-shaped valley, pothole and waterfall are formed due to the erosional work of a river.

(ii) Glaciers:

• As a glacier is nothing but a solid mass of ice, its velocity is very low. Nevertheless, the mass of water in the solid form is quite high. Therefore, glaciers cause a considerable amount of erosion.
• The glaciers erode the ice-clad base of the mountain slopes and the snow-clad sides of the mountains to a large extent.
• The Cirque, Arete and horn, U-Shaped valley and hanging valley are the landforms formed by the erosional work of a glacier.

(iii) Wind:

• The wind carries sand and pebbles.
• When they strike and scratch the rocks, the elevated and basal parts of the rocks get eroded.
• Due to the erosional processes of the wind, deflation hollows, mushroom rocks and yardangs3 are formed.

(iv) Sea waves:

• The basal portions of the headlands get severely eroded due to the continuous attack of sea waves. This leads to the erosion of the rocks on a large scale.
• Rocky coasts are formed where the headlands get severely eroded.
• Landforms such as sea cliffs, sea caves, wave-cut platforms, sea arches and sea stacks are formed due to the erosional work of sea waves.

(v) Groundwater:

• Soluble minerals in the rocks dissolve in water and they move along with the ground water. This process is called erosion by ground water.
• The work of ground water is predominant in the region where rock like limestone is found on a large scale.
• Limestone dissolves in carbonic acid. Carbonic acid is formed due to the presence of carbon dioxide in ground water. This acid dissolves carbonates like limestone. Thus, chemical weathering takes place.
• The landforms like sinkholes and caves are the result of the erosional work of groundwater.

In simple words: The earth's surface is constantly reshaped by agents like rivers, glaciers, wind, sea waves, and groundwater. Each agent performs erosion, transportation, and deposition, creating distinct landforms. Rivers carve valleys and gorges, glaciers sculpt U-shaped valleys, wind forms dunes and mushroom rocks, sea waves create cliffs and beaches, and groundwater forms caves and sinkholes.

🎯 Exam Tip: This is a comprehensive question. Organize your answer by listing each agent and then briefly describing its primary erosional and depositional landforms. Use clear, concise language for each point.

 

Question 2. List the landforms that are produced due to deposition of sediments by rivers.
Answer: Landforms like flood levees, flood plains, deltas are formed because of deposition of sediments,

1. Flood levees: When in flood, the river deposits; the coarser material on the banks which in duecourse rises parallel to the banks of the river. These are called 'flood levees'.
2. Flood plains: The finer silt deposited away from the banks during the flood form plains on either side of the river. They are called 'flood plains'.
3. Delta: The continuous deposition leads to the formation of a plain in the shape of a triangle called delta. Extensive deltas have been formed at the mouth of rivers Ganga, Godavari, Kaveri.

In simple words: Rivers deposit sediments to create several landforms: natural embankments along their banks called flood levees, flat fertile areas adjacent to the river known as flood plains, and triangular-shaped landforms at the river's mouth where it meets a larger body of water, known as deltas.

🎯 Exam Tip: Clearly define each depositional landform and explain the process by which river sediments accumulate to create them. Providing examples like the Ganga delta adds value.

 

Question 3. Write in detail about the erosional and depositional work of wind.
Answer:
(i) Erosional work of winds:

• Wind carries small sand particles, small pebbles, etc. along with it.
• These particles cause erosion along rocks coming in the way due to friction.
• This leads to formation of mushroom rocks, deflation hollows, yardangs, etc.

(ii) Depositional work of winds:

• Sand particles that blow with the winds are of different shapes and sizes.
• Those particles which are very fine are carried to larger distances while the larger ones get transported to shorter distances only.
• These sand particles get deposited in deserts and semi-arid climates. As a result, specific landforms are formed.
• Sand dunes, barchans, seifs, ripple marks, loessplains, etc. are formed by deposition by wind.

In simple words: Wind erodes by carrying abrasive particles that wear away rocks, forming features like mushroom rocks and yardangs. It deposits sediment when its energy drops, creating landforms such as various types of sand dunes, ripple marks, and vast loess plains.

🎯 Exam Tip: Clearly separate the erosional and depositional processes, providing specific landform examples for each. Emphasize how particle size and wind speed influence both processes.

 

Question 4. Write in detail about the erosional and depositional work of sea waves.
Answer:
(i) Erosional work of sea waves:

• When the waves break at the coast, they bring with them water, transported stones, pebbles, sand particles, etc. This leads to the erosion of the coast.
• Because of the chemical and hydraulic action of the sea wave too, the erosion occurs. The landforms like wavecut platforms, sea caves, sea arches, sea cliffs, etc. are formed because of the erosional work of the waves.

(ii) Depositional work of sea waves:

• The eroded materials accumulate at the sea bed. Because of tides, they keep on moving towards the coast and away from the coast.
• They become fine because of attrition and hitting towards each other.
• Deposition of such materials occurs at the places where the effect of waves is less. The landforms like beaches, sand bar, lagoons are formed due to the depositional work of the sea waves.

In simple words: Sea waves erode coastlines through forceful impact and abrasion, carving out features like cliffs, caves, arches, and wave-cut platforms. When wave energy decreases, they deposit sediments, forming landforms such as beaches, sand bars, and lagoons.

🎯 Exam Tip: Structure your answer by clearly distinguishing between erosional and depositional work. Provide specific examples of landforms for each process and briefly explain the mechanisms involved (e.g., hydraulic action, attrition).

Explain:

 

Question 1. Erosional work of rivers
Answer:

• The rivers originate at a much higher altitude from the sea level.
• Here, the river flows at a great speed and therefore, its power to erode is great.
• The riverbed and the river banks get eroded because of the speedy flow of the river, sand particles, pebbles. Also, various tributaries join the main river.
• All these lead to the formation of gorges (canyons), V-shaped valleys and waterfalls.

In simple words: Rivers begin at high altitudes with strong currents, giving them high erosional power. This fast-flowing water, along with carried sediments, carves out the riverbed and banks, creating deep gorges, V-shaped valleys, and dramatic waterfalls.

🎯 Exam Tip: Emphasize the connection between high elevation, fast flow, and the resulting erosional power. List key erosional landforms created by rivers as primary examples.

 

Question 2. Transportation and deposition by rivers
Answer:

• A river flows down the slope from a hilly region.
• At the foothills, the change in the slope causes deposition of coarse sediments.
• As these are deposited in a triangular shape, they form an alluvial fan. As the steepness of the slope decreases and the transport capacity of the river reduces, it starts flowing slowly.
• It bends (meanders) often in its way in an effort to cross even small obstacles.
• By the time the river reaches the sea, its riverbed becomes very wide and its speed becomes very slow.
• The sediments of the river get deposited in its bed and on its banks. The factors that determine the deposition of sediments are thelength of the rivers, volume of water, amountof sediments, and the slope of the river and the earth's surface.
• Thus, landforms like flood levees, flood plains, deltas are formed because of deposition of sediments.

In simple words: As a river moves from steep to gentler slopes, its speed slows, causing it to deposit sediments. This process forms alluvial fans at foothills, meanders where the river bends, and vast floodplains and deltas as it nears the sea and its carrying capacity diminishes.

🎯 Exam Tip: Trace the river's journey from high to low gradients, explaining how decreasing velocity and changing topography lead to sequential deposition of sediments and the formation of various landforms.

 

Question 3. Erosion work by glaciers
Answer:

• Though the velocity of glaciers is less, the mass of the ice is more and hence the glacier erodes its own banks and its bed on a large scale.
• The erosional work of glaciers produces landforms like cirques, aretes, horns, U-shaped valleys, hanging valleys and roche moutonnees (or sheepbacks).

In simple words: Despite moving slowly, the massive weight of a glacier allows it to powerfully erode rock. This grand sculpting forms unique features such as bowl-shaped cirques, sharp aretes, pointed horns, wide U-shaped valleys, and hanging valleys.

🎯 Exam Tip: Highlight the paradoxical nature of glacial erosion: slow movement but powerful erosive force due to mass. List the distinctive glacial erosional landforms, particularly the U-shaped valley.

 

Question 4. Transportation and deposition by glaciers
Answer:

• The glaciers carry sediments with them. These sediments are called moraines.
• Depending on the location of the deposits, moraines can be divided into 4 types: ground moraines, lateral moraines, medial moraines and terminal moraines.
• The depositional work of glacier produces landforms like drumlins, eskers, etc.

In simple words: Glaciers transport a significant amount of rock and sediment, known as moraines. These moraines are deposited in different locations, forming distinct types like ground, lateral, medial, and terminal moraines, and other landforms such as drumlins and eskers when the glacier retreats.

🎯 Exam Tip: Define moraines as the key depositional feature of glaciers. Detail the different types of moraines based on their location and mention other significant depositional landforms like drumlins and eskers.

 

Question 5. Erosional and depositional work of wind
Answer:

• Erosional work of wind: Wind carries smallsand particles, small pebbles, etc. along with it. These particles cause erosion along rockscoming in the way due to friction.
• This leads to formation of mushroom rocks, deflation hollows, yardangs, etc.
• Depositional work of winds: Sand particles that blow with the winds are of different shapes and sizes.
• Those particles which are very fine are carried to larger distances while the larger ones get transported to shorter distances only.
• These sand particles get deposited in deserts ; and semi-arid climates. As a result, specific landforms are formed.
• Sand dunes, barchans, seifs, ripple marks, loess plains, etc. are formed by deposition by wind.

In simple words: Wind erodes by using carried particles to abrade rocks, creating shapes like mushroom rocks. It deposits sediments when its speed drops, forming sand dunes (like barchans and seifs), ripple marks, and extensive loess plains, particularly in arid regions.

🎯 Exam Tip: Clearly separate erosion (abrasion, deflation) from deposition (when wind loses energy). Provide multiple, distinct examples of landforms for each process, especially focusing on common desert features.

 

Question 6. Erosional work of sea waves
Answer:

• When the waves break at the coast, they bring with them water, transported stones, pebbles, sand particles, etc.
• This leads to the erosion of the coast. Because of the chemical and hydraulic action of the sea wave too, the erosion occurs.
• The landforms like wave cut platforms, sea caves, sea arches, sea cliffs, etc. are formed because of the erosional work of the waves.

In simple words: Sea waves constantly crash onto coastlines, bringing water and abrasive sediments. This forceful impact, along with chemical and hydraulic action, erodes the rocks, creating characteristic coastal features such as wave-cut platforms, sea caves, sea arches, and sea cliffs.

🎯 Exam Tip: Explain the mechanisms of sea wave erosion (impact, abrasion, hydraulic action) and then list the resulting landforms. It's important to visualize how these features are carved out by wave action.

 

Question 7. Depositional work of sea waves
Answer:

• The eroded materials accumulate at the sea bed.
• Because of tides, they keep on moving towards the coast and away from the coast.
• They become fine because of attrition and hitting towards each other.
• Deposition of such materials occurs at the places where the effect of waves is less.
• The landforms like beaches, sand bar, lagoons are formed due to depositional work.

In simple words: Sea waves transport eroded sediments, which become finer due to constant movement and attrition. These sediments are deposited in areas with less wave energy, forming beaches, sand bars (underwater ridges), and lagoons (shallow water bodies separated by sand bars).

🎯 Exam Tip: Focus on the conditions under which deposition occurs (reduced wave energy) and how materials are processed (attrition). Provide clear examples of depositional landforms like beaches and lagoons.

 

Question 8. Work of groundwater and landforms
Answer:

• The rainwater seeps below the earth's surface through porous rocks or the cracks in the rocks.
• This water accumulates at the non-porous layer of the rock. This accumulated water is called groundwater.
• The soluble minerals in the water get dissolved and flow with the groundwater. This is the erosional work of the groundwater.
• When the groundwater evaporates or the volume of soluble minerals is more than the solubility of the groundwater, the deposition of dissolved materials starts.
• Landforms like sinkholes, limestone caves, stalactites and stalagmites are formed.
• Thus, the groundwater carries out the erosion, transportation and depositional work.

In simple words: Groundwater seeps through rocks, dissolving soluble minerals and eroding underground pathways. When this mineral-rich water evaporates or becomes oversaturated, it deposits the minerals, forming distinctive landforms like sinkholes, limestone caves, and the cave formations known as stalactites and stalagmites.

🎯 Exam Tip: Explain both the chemical erosion (dissolving minerals) and depositional (mineral precipitation) aspects of groundwater. Connect these processes directly to the formation of karst topography, including caves and their features.

 

Question 9. Groundwater table
Answer:

• The upper surface of the water accumulated below the ground is called the ground water table.
• Factors like seasons, porosity of rocks, amount of rainfall, etc. affect the level of water table.
• The water table is closer to the ground during rainy seasons while it is deeper in the summers.

In simple words: The groundwater table is the top level of water stored underground. Its depth varies based on factors like rainfall, rock porosity, and the season; it rises closer to the surface during rainy periods and sinks deeper in dry summers.

🎯 Exam Tip: Define the groundwater table clearly. Crucially, explain how its level fluctuates seasonally due to variations in precipitation and how rock properties influence its depth.

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