NCERT Solutions Class 7 Social Science Chapter 3 Our Changing Earth

NCERT Solutions Class 7 Social Science Chapter 3 Our Changing Earth have been provided below and is also available in Pdf for free download. The NCERT solutions for Class 7 Social Science have been prepared as per the latest syllabus, NCERT books and examination pattern suggested in Class 7 by CBSE, NCERT and KVS. Questions given in NCERT book for Class 7 Social Science are an important part of exams for Class 7 Social Science and if answered properly can help you to get higher marks. Refer to more Chapter-wise answers for NCERT Class 7 Social Science and also download more latest study material for all subjects. Chapter 3 Our Changing Earth is an important topic in Class 7, please refer to answers provided below to help you score better in exams

Chapter 3 Our Changing Earth Class 7 Social Science NCERT Solutions

Class 7 Social Science students should refer to the following NCERT questions with answers for Chapter 3 Our Changing Earth in Class 7. These NCERT Solutions with answers for Class 7 Social Science will come in exams and help you to score good marks

Chapter 3 Our Changing Earth NCERT Solutions Class 7 Social Science

 

NCERT Solutions for Class 7 for Social Science Geography Chapter 3 Our Changing Earth

1. Answer the following questions: 

(i) Why do plates move? 

Ans. Plates move because of the movement of molten magma inside the earth. The molten magma moves inside the earth in a circular manner. 

 

(ii) What are exogenic and endogenic forces? 

Ans. The forces which act on the surface of the earth are known as exogenic forces, whereas the forces which act in the interior of the earth are known as endogenic forces. 

 

(iii) What is erosion? 

Ans. The wearing away of landscape by different agent of nature like wind, water, and ice is known as erosion.  

 

(iv) How are flood plains formed? 

Ans. Layers of fine soil and other materials known as sediments are deposited along the banks of river, whenever a river floods. This leads to the formation of a fertile floodplain. 

 

(v) What are sand dunes? 

Ans. When the wind blows in a desert, it transports sand from one place to another. When it stops blowing, the sand falls and gets deposited in low hill-like structures, which are known as sand dunes. 

 

(vi) How are beaches formed? 

Ans. Beaches are formed when sediments carried by the sea waves are deposited along the shores. The finer sediments are deposited near the sea, while the coarser ones are deposited further inland. 

 

(vii) What are ox bow lakes? 

Ans. Rivers start meandering when they enter the plains. In due course of time, the meander loop cuts off from the river and forms a cut-off lake, which is also known as an ox bow lake. 

 

2. Tick the correct answer. 

(i) Which is not an erosional feature of sea waves? 

(a) Cliff                  (b) Beach            (c) Sea cave 

(ii) The depositional feature of a glacier is: 

(a) Flood plain        (b) Beach                 (c) Moraine

(iii) Which is caused by the sudden movements of the earth? 

(a) Volcano       (b) Folding                (c) Flood plain 

(iv) Mushroom rocks are found in: 

(a) Deserts      (b) River valleys         (c) Glaciers 

(v) Ox bow lakes are found in: 

(a) Glaciers           (b) River valleys      (c) Deserts  

3. Match the following. 

(i) Glacier              (a) Sea shore 

(ii) Meanders        (b) Mushroom rock 

(iii) Beach             (c) River of ice 

(iv) Sand dunes    (d) Rivers 

(v) Waterfall         (e) Vibrations of earth 

(vi) Earthquake     (f) Sea cliff 

                            (g) Hard bed rock 

                            (h) Deserts 

Ans. 

(i) Glacier                (c) River of ice 

(ii) Meanders           (d) Rivers  

(iii) Beach               (a) Sea shore 

(iv) Sand dunes       (h) Deserts 

(v) Waterfall           (g) Hard bed rock 

(vi) Earthquake       (e) Vibrations of earth 

 

4. Give reasons. 

(i) Some rocks have a shape of mushroom. 

Ans. Erosion of rocks in a desert by wind progresses at a different rate at its bottom to that at its top. Winds erode lower section of rocks more than the upper section. Thus, rocks take the shape of a mushroom, i.e., narrower at the base and wider at the top. 

(ii) Flood plains are very fertile. 

Ans. Flood plains are formed due to depositional activity of rivers. Sometimes, the rivers flood and layers of fine sediments and other materials are deposited along its banks. This causes floodplains to be formed. The deposited sediments and other materials make the land fertile. 

(iii) Sea caves are turned into stacks. 

Ans. Continuous striking of sea waves against the rocks causes the rocks to develop hollow like caves on them. These hollows are known as sea caves. They become larger and larger due to continuous erosion, leaving the cave with only a roof, thus forming sea arches. Further erosion breaks the roof and only walls are left. These wall like structures are known as stacks. 

(iv) Buildings collapse due to earthquakes. 

Ans. An earthquake is a sudden release of energy from the earth’s crust that travels in waves. When the intensity of earthquake is high, it can cause damage to many man-made and natural things on the surface of the earth. Buildings can collapse when they cannot stand the intensity of earthquake. 

5. Activity. 

Observe the photographs given below. These are various features made by a river. Identify them and also tell whether they are erosional or depositional or landforms formed by both. 

photo

6. For fun. 

Solve the crossword puzzle with the help of given clues. 

crossword

 

Across: 

2. Loop like the bend of a river: Meander 

4. Solid form of water: Ice 

7. Moving mass of ice: Glacier 

9. Sudden descent of water in the bed of a river: Waterfall 

11. Natural cavity on weak rocks formed by the action of waves: Cave 

12. Embankment on a river that keeps it in its channel: Levee 

13. Large body of water: Sea 

14. Dry area where sand dunes are found: Desert 

15. Small hill of sand caused by the action of wind: Sand dune 

16. Flat plain formed by river deposits during time of flood: Floodplain 

Down: 

1. Rise and fall of water caused by friction of wind on water surface: Wave 

3. Flow of water in a channel: River 

5. Steep perpendicular face of a rock along a sea coast: Cliff 

6. Debris of boulder and coarse material carried by glacier: Moraine 

8. Crescent shaped lake formed by a meandering river: Oxbow lake 

10. Fine sand deposited by the action of wind: Loess 

13. Isolated mass of rising steep rock near a coastline: Stack 

14. Alluvial tracts of land formed by the river deposits at the mouth of a river: Delta 

Our Environment Chapter 01 Environment
NCERT Solutions Class 7 Social Science Chapter 1 Environment
Our Environment Chapter 02 Inside Our Earth
NCERT Solutions Class 7 Social Science Chapter 2 Inside Our earth
Our Environment Chapter 03 Our Changing Earth
NCERT Solutions Class 7 Social Science Chapter 3 Our Changing Earth
Our Environment Chapter 06 Natural Vegetation and Wild Life
NCERT Solutions Class 7 Social Science Chapter 6 Natural Vegetation and Wildlife
Our Environment Chapter 07 Human Environment Settlement, Transport and Communication
NCERT Solutions Class 7 Social Science Chapter 7 Human Environment Settlement Transport Communication
Our Environment Chapter 08 Human Environment Interactions The Tropical And The Subtropical Region
NCERT Solutions Class 7 Social Science Chapter 8 Human Environment Interactions The Tropical And The Subtropical Region
Our Environment Chapter 09 Life in the Deserts
NCERT Solutions Class 7 Social Science Chapter 9 Life in the Deserts
Our Pasts II Chapter 01 Tracing Changes Through a Thousand Years
NCERT Solutions Class 7 Social Science Chapter 1 Tracing Changes Through A Thousand Years
Our Pasts II Chapter 02 New Kings and Kingdoms
NCERT Solutions Class 7 Social Science Chapter 2 New Kings and Kingdoms
Our Pasts II Chapter 03 The Delhi Sultans
NCERT Solutions Class 7 Social Science Chapter 3 The Delhi Sultans
Our Pasts II Chapter 04 The Mughal Empire
NCERT Solutions Class 7 Social Science Chapter 4 The Mughal Empire
Our Pasts II Chapter 05 Rulers And Buildings
NCERT Solutions Class 7 Social Science Chapter 5 Rulers and Buildings
Our Pasts II Chapter 06 Towns Traders And Craftspersons
NCERT Solutions Class 7 Social Science Chapter 6 Towns Traders and Craftspersons
Our Pasts II Chapter 07 Tribes, Nomads And Settled Communities
NCERT Solutions Class 7 Social Science Chapter 7 Tribes Nomads and Settled Communities
Our Pasts II Chapter 08 Devotional Paths To The Divine
NCERT Solutions Class 7 Social Science Chapter 8 Devotional Paths to the Divine
Our Pasts II Chapter 09 The Making Of Regional Cultures
NCERT Solutions Class 7 Social Science Chapter 9 The Making of Regional Cultures
Our Pasts II Chapter 10 Eighteenth Century Political Formations
NCERT Solutions Class 7 Social Science Chapter 10 Eighteenth Century Political Formations
Social and Political Life-II Chapter 01 On Equality
NCERT Solutions Class 7 Social Science Chapter 1 On Equality
Social and Political Life-II Chapter 03 How the State Government Works
NCERT Solutions Class 7 Social Science Chapter 3 How the State Government Works
Social and Political Life-II Chapter 04 Growing up as Boys and Girls
NCERT Solutions Class 7 Social Science Chapter 4 Growing up as Boys and Girls
Social and Political Life-II Chapter 05 Women Change the World
NCERT Solutions Class 7 Social Science Chapter 5 Women Change the World
Social and Political Life-II Chapter 06 Understanding Media
NCERT Solutions Class 7 Social Science Chapter 6 Understanding Media
Social and Political Life-II Chapter 07 Markets Around Us
NCERT Solutions Class 7 Social Science Chapter 7 Markets around Us
Social and Political Life-II Chapter 08 A Shirt in the Market
NCERT Solutions Class 7 Social Science Chapter 8 A Shirt in the Market

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NCERT Solutions Class 7 Social Science Chapter 3 Our Changing Earth

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Chapter 3 Our Changing Earth Class 7 Social Science NCERT Solutions

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NCERT Solutions Chapter 3 Our Changing Earth Class 7 Social Science

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Chapter 3 Our Changing Earth Class 7 NCERT Solution Social Science

These solutions of Chapter 3 Our Changing Earth NCERT Questions given in your textbook for Class 7 Social Science have been designed to help students understand the difficult topics of Social Science in an easy manner. These will also help to build a strong foundation in the Social Science. There is a combination of theoretical and practical questions relating to all chapters in Social Science to check the overall learning of the students of Class 7.

Class 7 NCERT Solution Social Science Chapter 3 Our Changing Earth

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