Voyage Solutions for ICSE Class 6 Geography Chapter 3 Major Landforms Of The Earth

POINTS TO REMEMBER

1. Nearly $29$ per cent of earth’s surface is land.
2. Land features on the surface of the earth are different in different places. These features are called landforms. The major landforms include mountains, plateaux, valleys and plains.
3. There are three main types of mountains-fold mountains, volcanic mountains and block mountains.
4. There are two types of fold mountains-old and young.
5. Plateaux are also called plains-in-the air or tablelands.
6. Plains are flat lowlands that are mostly built by the alluvium deposited by rivers.

IMPORTANT TERMS

1. Fold mountains: Mountains that are formed when horizontal layers of the earth’s crust are folded by compression.
2. Landforms: Features of the land surface.

Discuss
 

Question : Formation of landforms is a continuous process. Discuss the different ways in which landforms are changing around the world.
Answer:
The earth’s surface is constantly changing. These changes mostly occur in very minute ways which over time accumulates to create the earth’s physical features. Whereas some of these changes take thousands of years but surely they are occuring. We look around us that a mountain, river, plateau, valleys, rqck boulders etc. these all didn’t just disappear suddenly rather most of them had a building process.
There are basically two types of changes that occur on the earth’s surface.
1. Slow change
2. Fast change.
Fast change occur through the actions of earthquakes, volcanoes, landslides etc. While slow change takes time and has a process. Slow changes like weathering take ages to shape the Earth, while fast ones like volcanic eruptions happen in seconds. This constant movement is what keeps the Earth's surface looking dynamic and ever-evolving.
Teacher's Tip: Think of slow changes like a slow-drying painting and fast changes like a balloon popping suddenly.
Exam Tip: Always mention both internal forces (like volcanoes) and external forces (like rivers) when discussing landform changes.

VALUES AND LIFE SKILLS
We constantly impact landforms around us by our actions such has mining, building roads, dams, etc. We should, therefore, try to minimize such activities that have an adverse impact on landforms around us.

Question : How can you help to preserve the landforms around you?
Answer:
We can preserve the landforms around us by adopting following methods, and they are :
1. By Planting More Trees and Not cutting them.
2. By Properly Disposing the Industrial waste.
3. By Preserving greenery surrounding, National Parks and Wildlife Sancturies.
4. Avoid de-vegetating the landforms and its Vicinity, if that’s it’s natural condition.
5. Replicate Natural landscapes, patterns and processes. Protecting our land means ensuring that future generations can enjoy the same natural beauty and resources we have today. By being careful about how we build and mine, we prevent disasters like soil erosion and landslides.
Teacher's Tip: Use the "3 Rs" (Reduce, Reuse, Recycle) to help keep our natural landforms clean and healthy.
Exam Tip: Provide specific examples like "afforestation" to show you know practical solutions for preserving land.

EXERCISES

A. Match the columns
A | B
1. the Appalachians | (i) low-lying lands between hills or mountains
2. vent | (ii) old fold mountains in North America
3. faulting | (iii) the opening through which lava comes to the surface
4. valleys | (d) the rupturing or fracturing of rock strata due to strain

Answer:
A | B
1. the Appalachians | (ii) old fold mountains in North America
2. vent | (iii) the opening through which lava comes to the surface
3. faulting | (iv) the rupturing or fracturing of rock strata due to strain
4. valleys | (i) low-lying lands between hills or mountains. These matches represent the basic characteristics and definitions of various geological features. Knowing these definitions helps you identify the physical world correctly during your studies.
Teacher's Tip: To remember "vent," think of a chimney letting out smoke, but for a volcano!
Exam Tip: Draw straight lines if matching or write the numbers clearly next to the options to avoid confusion.

B. With the help of your atlas identify and mark the following in an outline map of the world.

Question 1: An old fold mountain range in India.
Answer:
Aravallis. The Aravallis are one of the oldest fold mountains in the world and stretch across northwestern India. They play a key role in preventing the desert from expanding towards the east.
Teacher's Tip: Remember the Aravallis are "Old" like a "Grandpa" mountain range in India.
Exam Tip: Mark them on the map with a series of small inverted 'v' shapes to show a mountain chain.

Question 2: A block mountain in Europe
Answer:
The Black Forest of Europe. This block mountain was formed when the land rose between parallel fault lines millions of years ago. It is famous for its dense evergreen trees and picturesque landscapes in Germany.
Teacher's Tip: It is called "Black" because the trees are so thick they block out much of the sunlight!
Exam Tip: Specify that it is located in Germany to get full geographic points for location questions.

Question 3: A storehouse of mineral wealth in eastern India.
Answer:
The Chota Nagpur Plateau. This plateau is rich in essential resources like coal and iron ore which help India's industrial economy. It is often called the "Ruhr of India" because of its great mineral and industrial importance.
Teacher's Tip: Think of "Chota" as a small box filled with very "Big" and valuable treasures.
Exam Tip: Mention at least two specific minerals (like coal and iron) found there to provide a detailed answer.

Question 4: A rift valley in Egypt
Answer:
Nile Valley in Egypt. The rift valley was created when the land between two faults sank deep into the Earth's crust. The Nile River flows through this valley, bringing life-giving water to the vast desert regions.
Teacher's Tip: A rift valley is like a giant "crack" or "trench" in the ground.
Exam Tip: Note that it is part of the Great Rift Valley system to show advanced knowledge.

C. Answer the following questions in brief

Question 1: What are Fold Mountains? With the help of a neat-sketch, briefly explain their formation.
Answer:
The mountains that are formed when the layers of the earth’s crust are folded by compression caused by the forces generated by movements inside the earth. There are particularly two types of fold mountains, they are :
1. Old fold mountains
2. Young fold mountains. When two landmasses push against each other, the rock layers buckle and rise up. This process is very similar to how a rug bunches up when you push it across a floor.
Teacher's Tip: Think of "Folding" like folding a piece of paper in the middle to make it taller.
Exam Tip: Drawing a simple diagram showing two horizontal arrows pushing inwards will help the examiner see you understand "compression."

Question 2: State two chief differences between old and young fold mountains. Give examples.
Answer:
The mountains which were formed over $250$ million years ago due to compression of earth’s crust are called old fold mountains. They have gentle slopes and low altitude due to weathering overtime e.g. Urals in Russia, Aravallis in India and Appalachians in India. The recently formed mountains i.e. about $25$ million years ago are called young fold mountains. They are rugged and lofty. They comprise the world’s highest mountain ranges. E.g. Rockies of North America, Alps, Andes, Himalayas and The great Dividing Range. Old fold mountains have rounded tops because they have been worn down by wind and rain over ages. Young fold mountains are still sharp and tall because they are much newer and still growing.
Teacher's Tip: Young = Sharp and Tall; Old = Low and Round.
Exam Tip: Use a comparison table to show these differences clearly for easier grading and higher marks.

Question 3: What are plateaux? Why are they of great economic value?
Answer:
Plateaux (plural of plateau) are the uplifted sections of the earth’s crust that are almost flat or level and usually descend steeply to the surrounding lowlands. Aplateau is also sometimes referred to as a plain-in-the air or tableland. The land of a plateau is very fertile while the latter is a storehouse of mineral wealth. They are rich in minerals like gold, iron, copper, manganese, etc. Because they are flat on top but high up, plateaus are perfect for mining activities. Many of the world's major mining hubs are located on plateaus due to this high concentration of valuable ores.
Teacher's Tip: Think of a plateau as a giant natural "table" in the landscape.
Exam Tip: Mention "mineral wealth" and "mining" as the key reasons for their high economic value.

Question 4: Mention the different types of plateaux.
Answer:
Types of Plateaux - Plateaus may be classified into the following categories on the basis of their formation, appearance and location:
Tectonic Plateau : A tectonic plateau is formed by the movement of the earth’s crustal plates. Tectonic movement causes a huge portion of the earth’s surface to rise. The plateau of South Africa and the Turkish-Iranian Plateau are examples of tectonic plateaus.
Volcanic Plateau : A volcanic plateau is a plateau formed by the spread of successive layers of lava on a particular region. When the lava cools, it solidifies and the successive sheets of lava finally form a raised tabeland or a plateau over a period of time. The extensive Columbia Plateau (in the north-western part of the U SA), the north western part of the Deccan Plateau and the Malwa Plateau are examples of volcanic plateaus.
Dissected Plateau : These have irregular surface marked by canyons, gorges and steep, narrow valleys formed by the process of erosion. They are mostly common in dry and desert regions. The Colorado Plateau, through which the Grand Canyon passes, and the Brazilian Plateau (Mato Grosso) are examples of dissected plateaus.
Intermontane Plateau : These are surrounded by mountains and are the most common types of plateau. The most common example of an intermontane plateau is the Tibetan Plateau which is enclosed by the Himalayan Mountains to its south and the Kunlun Shan to its north.
Piedmont Plateau : Piedmont plateau is one that lies between a mountain and a plain or an ocean. Examples of piedmont plateaus are the Patagonia Plateau in South America and the piedmont Plateau of North America. Each type of plateau tells a story about how the Earth's crust has moved or been shaped by lava and water. They are found all over the world, each with unique heights and mineral contents.
Teacher's Tip: "Intermontane" means "between mountains"—just look at the name!
Exam Tip: Be sure to provide at least one example for each type of plateau you list.

Question 5: What is a basin ? Give an example.
Answer:
A basin is a depressed section of the earth’s crust surrounded by higher land. Many basins are found alongside plateau edges and form areas of inland drainage, i.e., the rivers flowing in the basin do not reach reach the sea. The Tarim and Tsaidam Basins of Asia and the Chad Basin of north-central Africa are examples of basin. A basin is like a giant bowl in the ground where water collects. Because it is surrounded by hills or mountains, any water that flows in often stays there and creates unique ecosystems.
Teacher's Tip: Think of a kitchen sink (basin) that holds water; it's the same shape as a land basin!
Exam Tip: Define a basin as a "low-lying" or "depressed" area to be precise.

Question 6: Mention the different types of plains.
Answer:
Types of Plains: On the basis of formation, plains are grouped in three categories:
Structural Plains: Plains that lie near the coast of a sea or an ocean are called structural plains. Due to endogenetic movements, large, broad, flat areas of the sea floor are raised and appear on the surface. These types of plains are very flat and broad. The addition of sediments brought in by the sea waves over a period of time makes them broader and flatter than they originally were. Structural plains border all countries. The coastal plains of south-eastern USA near the Gulf Coast, which are part of the Great Plains, are one of the largest plains in the world. The plains of northern Russia and the central lowlands of Australia are other examples of structural plains.
Erosional Plains: Erosional plains are the result of the erosion of mountains, hills and plateaux. The eroded material is brought down to a low level by wind, rivers, rain, and ice. This kind of erosion caused by various agents gives rise to several types of plains. The plains of northern Canada, northern Europe and Kashmir in India are examples such plains.
Depositional Plains : Depositional plains are formed by sediments brought down on a large scale by natural agents such as moving ice, water and wind from the upper regions of mountains. Plains are the most human-friendly landforms because they are easy to build on. Whether formed by rising sea floors or river deposits, they provide the best land for cities and farms.
Teacher's Tip: Structural = Raised up; Erosional = Worn down; Depositional = Filled in.
Exam Tip: Mention the "agents of erosion" (wind, water, ice) when explaining erosional plains.

Question 7: What is the importance of plains ?
Answer:
The importance of the plains are discussed below:
1. Plains are important because they are good source of fresh fruits and vegetables.
2. Plains are being ploughed by a farmer or a carabaos.
3. Owing to the flat nature of the land. It is easy to construct roads and railways in plains.
4. Plains have good and rich source of river which is very fertile for crops. Because they are flat and often have water nearby, plains support large populations and industries. They are the breadbaskets of the world where most of our food is grown.
Teacher's Tip: Flat land means easy building—that's why most big cities are in the plains!
Exam Tip: List at least three points including agriculture and transportation for a complete answer.

Question 8: What is a peninsula? Take the help of your atlas and name four major peninsulas of the world.
Answer:
A Peninsula is a piece of land that is surrounded by water on three sides and joined to a larger land mass. The peninsular plateau of India and the Malay Peninsula are two examples of peninsulas attached to the continent of Asia. Europe is a peninsula of peninsulas. Can you name the three large water bodies that surround it ? Also identify the smaller peninsulas that jut out from it. Arabian peninsula, Deccan for major peninsula are peninsulas, Indo-China peninsula, Alaska peninsula. A peninsula is like a finger of land pointing out into the ocean. Because they have so much coastline, they are often important for fishing and sea trade.
Teacher's Tip: Think of the word "Peninsula" as meaning "Almost an Island."
Exam Tip: Be sure to state that it is surrounded on "three sides" to differentiate it from an island.

Question 9: Which two land masses does the Isthmus of Panama connect?
Answer:
The Isthmus of Panama joins North America and South America with the Pacific Ocean on one side and the Atlantic Ocean on the other. The Isthmus of Suez joins Africa to Asia and separates the Mediterranean Sea and the Red Sea. An isthmus is a very narrow bridge of land between two huge continents. It acts as a vital link for land travel while separating two massive oceans.
Teacher's Tip: An Isthmus is the opposite of a Strait (which is a narrow water passage).
Exam Tip: Identify both the landmasses connected and the water bodies separated for a perfect answer.

D. Answer the following questions in one or two paragraphs:

Question 1: Name the major landforms on earth.
Answer:
The major landforms on earth are :
Mountains - Most of the rivers originate from mountains. They are rich in minerals and metals deposits and support variety of flora and fauna.

• Plateau - They are storehouses of minerals such as gold, silver, iron, copper, manganese, etc.
• Valley - They are low-lying lands between hills formed by river flowing down the mountains or due to movement of earth plates.
• Plains - They are the most fertile landforms which support easy habitation. These four features define the shape of our world's surface. Each one provides different resources and challenges for the people who live there.

Teacher's Tip: Visualize the Earth as a bumpy ball where mountains are the peaks and valleys are the troughs.
Exam Tip: Write one sentence about why each landform is important to get full marks.

Question 2: List the continents according to size. Describe the two largest continents in detail.
Answer:
Continents are very large land masses that are surrounded by vast water bodies called oceans on all sides. They are the primary divisions of land. There are seven continents in the world. Asia is the largest continent. It occupies about one-third of the land area of our planet. It is joined to the land mass of Europe and, thus, we use the term Eurasia for this combined land mass. The Ural Mountains, the Black Sea and the Caspian Sea separate the two continents. We find oceans on three sides of this land mass. To its north lies the Arctic Ocean, to its east is the Pacific Ocean and to its south is the Indian Ocean. Africa is the second largest continent after Asia. It is surrounded by water bodies on all sides. In the north, the Mediterranean Sea separates it from Europe, and on its east is the Indian Ocean. The Atlantic Ocean in the west separates it from the two Americas. In Africa lies the largest desert of the world, the Sahara Desert. Asia and Africa together hold most of the world's population and land area. Their diverse climates range from the frozen Arctic to the hottest deserts.
Teacher's Tip: Use the acronym "AS-AF-NA-SA-AN-EU-AU" to remember the order from largest to smallest!
Exam Tip: When describing a continent, mention the major oceans or mountain ranges that border it.

Question 3: Write short notes on
1. Europe
2. Australia.
Answer:
1. Europe is smaller in size in comparison to the other continents mentioned above but has some of the most developed nations in the world. To its north is the Arctic Ocean. The Atlantic Ocean separates it from North America. It has the most indented coastline among the continents, which is why it has numerous ports and some of the finest harbours in the world.
2. Australia is sometimes called ‘the Land Down Under’ as it lies to the south of the main land masses. It is also the smallest continent in size. As there is water on all sides-the Indian Ocean in the west, the South Pacific Ocean in the east, the Southern Ocean in the south, and the Arafura Sea in the north- it is an island and is, therefore, also called the ‘island continent’. Europe is known for its history and industrial power, while Australia is unique because it is both a continent and a country. Both are surrounded by major seas that influence their economies through trade and fishing.
Teacher's Tip: Australia is the "Island Continent" because it's the only one completely surrounded by water.
Exam Tip: Mention the "indented coastline" for Europe as it explains why they have so many harbors.

Question 4: How is Mount Fuji of Japan different from the Vosges of Europe?
Answer:
Mount Fuj i is a volcanic mountain formed when molten lava, ash, dust, etc. come out through cracks in earth’s crust and is accumulated in shape of high cone. Where as Vosges in Europe are formed by rupturing or fracturing of rock strata due to strain and is an example of block mountain. This shows that mountains can look similar but have totally different origins deep within the Earth. One is built up by eruptions, while the other is created by the cracking and lifting of huge blocks of land.
Teacher's Tip: Fuji is a "piler" (piling up lava) while Vosges is a "lifter" (lifting up land blocks).
Exam Tip: Use the terms "volcanic" and "block mountain" to define the specific category of each mountain.

Question 5: Briefly describe the importance of mountains.
Answer:
Importance of Mountains:
1. Mountains are a storehouse of water. Many rivers originate in the glaciers in the mountains.
2. Reservoirs are made and the water from the mountains is used for irrigation and generation of hydro-electricity.
3. The river valleys and terraces are most suitable for farming and cultivation of crops as the land is very fertile.
4. Mountains support a rich variety of flora and fauna.
5. Mountains also affect the climate of an area. For example, the Himalayas cause rainfall in India by blocking the south-west monsoon winds. They also protect us from the cold winds of Central Asia in winter.
6. Mountains are also rich in mineral and metal deposits which are essential for industries.
7. According to the United Nations Development Programme, mountains provide home for around $720$ million people.
8. The forests in the mountainous regions provide fuel, fodder, shelter and other products like gum, wild fruits, mushrooms, resins, etc. mountains provide an ideal holiday for tourists. They visit the for their natural scenic beauty and relaxation.
9. Many recreation, sporting and tourism activities takes place in the mountains. Paragliding, hang gliding, river rafting and skiing are popular sports in the mountains. Mountains are essential for life on Earth as they act as natural water towers and climate controllers. Without them, many regions would be dry deserts or exposed to harsh winds.
Teacher's Tip: Think of mountains as the Earth's "Water Towers" and "Weather Shields."
Exam Tip: List at least five different points to ensure you get full credit for a "describe" question.

Question 6: How is a volcanic mountain formed?
Answer:
Volcanic mountains are formed when molten lava, ash, cinder and dust from deep inside the earth come out on the surface through cracks in the earth’s crust and accumulate in the shape of high cones. The opening through which lava and other materials come to the surface is called a vent. The funnel-shaped depression at the top of a vent is called a crater. Examples - Mountain Fujiyama in Japan, Mountain Mayon in the Philippines. These mountains are essentially built layer by layer from the inside out. Over many years, the cooled lava creates a massive, cone-shaped peak.
Teacher's Tip: It's like a giant natural "wax candle" that keeps dripping and getting thicker at the bottom.
Exam Tip: Include the terms "vent" and "crater" in your explanation to show technical accuracy.

Question 7: What is a V-shaped valley?
Answer:
The valley which is formed by an exogenous process i.e. from the outside like a river flowing down the mountain eroding the soil and minerals form a V-shaped valley, eg. Rhine valley in Europe and Damodar valley in India. As the fast-moving river cuts deep into the mountain floor, the sides also wear down to form a 'V' shape. This is a classic example of how water can carve out massive features in solid rock over long periods.
Teacher's Tip: The 'V' stands for "Vertical cutting" by a river!
Exam Tip: Mention "river erosion" as the primary cause of a V-shaped valley.

Question 8: Briefly explain
1. peninsula
2. island
3. isthumus.
Answer:
1. Peninsula: is a piece of land that is surrounded by water on three sides and joined to a larger land mass. The peninsular plateau of India and the Malay Peninsula are two examples of peninsulas attached to the continent of Asia. Europe is a peninsula of peninsulas. Can you name the three large water bodies that surround it ? Also identify the smaller peninsulas that jut out from it. Arabian peninsula, Deccan for major peninsula are peninsulas, Indo-China peninsula, Alaska peninsula and Labrador peninsula.
2. Island : An island is a piece of land which is surrounded on all sides by water. India has two groups of islands – the Lakshadweep Islands in the Arabian Sea and the Andaman and Nicobar Islands in the Bay of Bengal.
3. Isthumus : An isthmus is an elongated narrow piece of land, with water on each side, that joins two large land masses. For example, the Isthmus of Panama joins North America and South America with the Pacific Ocean on one side and the Atlantic Ocean on the other. The Isthmus of Suez joins Africa to Asia and separates the Mediterranean Sea and the Red Sea. These three terms describe how land and water interact at the edges of continents. They are vital geographic concepts for understanding maps and navigation.
Teacher's Tip: Island = Surrounded by 4 sides; Peninsula = Surrounded by 3 sides; Isthmus = 2 big lands joined by a thin strip.
Exam Tip: Draw a small simple sketch for each definition to make your answer stand out.

E. Draw neat, labelled, coloured sketches to show the characteristics of each of the following geographical features. Write a brief description alongside, explaining each of them

Question 1: Block mountain
Answer:
Block mountain-They are formed by rupturing or fracturing of rock strata due to strain. The land between the cracks inside the earth sink leaving upstanding blocks on either side making mountains. When the Earth's crust cracks, huge blocks can be pushed up or drop down. The raised blocks become mountains, and the sunken ones become valleys.
Teacher's Tip: Think of a set of piano keys where some are pressed down and others stay up.
Exam Tip: Use the words "Uplift" and "Subsidence" in your diagram labels to show high-level vocabulary.

Question 2: Volcanic mountain
Answer:
Volcanic mountain - They are built when molten lava, ash, cinder and dust from deep inside the earth comes out on the surface through cracks in the earth’s crust and accumulate in the shape of high cones. The opening through which lava and other materials come to the surface is called a vent. The funnel-shaped depression at the top of a vent is called a crater. These mountains are created by the Earth's internal heat escaping to the surface. As the lava cools, it forms a permanent conical structure.
Teacher's Tip: Label the "Magma Chamber" at the bottom of your drawing to show where the lava starts.
Exam Tip: Color your volcanic mountain with reds and oranges for lava and gray for ash to make it look professional.

Question 3: Plateau
Answer:
Plateau - It is the uplifted section of the earth’s crust that are almost flat or level and usually descend steeply to the surrounding lowlands, eg. Deccan Plateau and the Chota Nagpur plateau etc. A plateau looks like a flat-topped mountain. It has at least one side with a very steep cliff leading down to lower land.
Teacher's Tip: Think of it as a mountain that had its pointed top sliced off!
Exam Tip: Make sure to draw the top of the plateau as a horizontal line to show it is "flat."

Question 4: Rift valley
Answer:
Rift Valley-The rift valley is the type of valley that is formed when the land between the two faults sink i.e. the land between $2$ block mountains is called rift valley. This creates a deep, long trench between two mountain ranges. It is the result of the Earth's crust pulling apart in different directions.
Teacher's Tip: A Rift Valley is the "low partner" to the "high" Block Mountain.
Exam Tip: Use arrows in your diagram to show the central block sinking downwards.

F. Picture study
Look at the photographs of a plain and a plateau given here and answer the questions.

Question 1: How does a plain look different from a plateau?
Answer:
A plain is a flat piece of land where it is very easy to build houses, roads and carry agricultural practices whereas a plateau is a flat raised piece of land with steep slopes and high cliffs from the surrounding land which makes the soil rich in minerals like iron, copper, manganese. While both can be flat, a plain is at a low level near the sea, while a plateau is high up in the air like a table. This height difference changes what grows there and how people use the land.
Teacher's Tip: Plain = Flat at the bottom; Plateau = Flat at the top.
Exam Tip: Mention "elevation" as the main difference between these two landforms.

Question 2: Why are river plains thickly populated?
Answer:
The river plains are thickly populated as it is easier to make buildings, construct roads and have all kinds of transportation facilities. The land is also very fertile, rich in minerals. Thus, making it easier for people to grow crops for their living. Flat land allows cities to grow in all directions without mountains in the way. Also, the availability of river water is essential for drinking and industry.
Teacher's Tip: Where there is water and flat land, there are always people!
Exam Tip: Use the word "accessibility" to explain why transportation is easier on plains.

Question 3: How is life in the plains different from life in the mountains?
Answer:
Landforms also influence weather. The higher one goes the colder it gets, while down in the plains and valleys it is warmer. Since landforms affect climate they also affect farming. It is more difficult to grow crops and rear cattle on hillsides than it is in the plains. In the plains, it is easier for people to make roads and houses and to dig wells, unlike in the mountains where it is difficult and expensive to make them and water has to be brought from distant streams. In other words, life in the mountains is more difficult than life in the plains. People in the plains have better access to jobs and services due to easier travel. In the mountains, life is quieter but often harder due to the rugged terrain and cold weather.
Teacher's Tip: Life in the plains is like "Easy Mode" while life in the mountains is "Hard Mode" for humans!
Exam Tip: Contrast the "climate" and "transportation" of both areas for a high-scoring answer.