Courses
Courses for Kids
Free study material
Offline Centres
More
Store Icon
Store

NCERT Solutions For Class 7 Social Science Our Environment Chapter 3 Our Changing Earth - 2025-26

ffImage
banner

Class 7 Social Science Our Environment Chapter 3 Questions and Answers - Free PDF Download

NCERT Solutions for Class 7 Geography Chapter 3 - "Our Changing Earth" by Vedantu provides clear and simple explanations to help students understand the natural forces that change our planet. Our Changing Earth Class 7 explores how natural forces like earthquakes, volcanoes, and weathering constantly change the Earth's surface. Class 7 Geography NCERT Solutions provides detailed answers to all questions in the NCERT textbook.

toc-symbolTable of Content
toggle-arrow


Class 7 Geography Chapter 3 Questions and Answers are given answers to all the questions in this chapter. Our Changing Earth Class 7 PDF is prepared by Vedantu experts to help students understand these concepts easily, prepare effectively for exams, and build a strong foundation in geography. Download the FREE PDF for Geography Class 7 Chapter 3 prepared by Vedantu Experts and updated according to the CBSE Class 7 Social Science Syllabus. Start with Vedantu to pursue a path of academic excellence!

Courses

Access NCERT for Class 7 Geography Chapter 3 Questions and Answers

1. Answer the following questions.

i. Why do the plates move?

Ans: There is constant generation of energy due to various processes undergoing in the inner layers of the Earth. Due to this amount of heat energy, the plates also move.

ii. What are exogenic and endogenic forces?

Ans: The forces that act on the earth's surface are called exogenic forces while the ones that act in the earth's interior are called endogenic forces.

iii. What is erosion?

Ans: The wearing away of the landscape by various agents like wind, water, and ice is called erosion.

iv. How are flood plains formed?

Ans: Flood plains are formed due to deposition of silt in the region during floods. When water gets out, the silts remain and they form the flood plains.

v. What are sand dunes?

Ans: The small hill-like structures of sand formed due to the action of wind are called sand dunes.

vi. How are beaches formed?

Ans: When sea waves deposit materials on the shores of the sea, beaches are formed.

vii. What are ox-bow lakes?

Ans: When a river changes its course suddenly, an oxbow lake is formed.

2. Tick the correct Answer.

i. Which is not an erosional feature of sea waves?

a) Cliff

b) Beach

c) Sea cave

Ans. (c) Sea Cave

ii. The depositional feature of a glacier is:

a) Flood Plain

b) Beach

c) Moraine

Ans. (c) Moraine

iii. Which is caused by the sudden movements of the earth?

a) Volcano

b) Folding

c) Flood Plain

Ans. (a) Volcano

iv. Mushroom rocks are found in:

a) Deserts

b) River valleys

c) Glaciers

Ans: (a) Deserts

v. Ox bow lakes are found in:

a) Glaciers

b) River valleys 

c) Deserts

Ans: (b) River valleys

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 a mushroom.

Ans: It is because they are formed when the winds erode the lower part of a rock more than the upper part.

ii. Flood plains are very fertile.

Ans: It is because they are formed by sediments of rivers which deposit the fertile land and silt with high mineral content in them.

iii. Sea caves are turned into stacks.

Ans: It is because over the time of erosion, the structure gets changed from cracks to stacks.

iv. Buildings collapse due to earthquakes.

Ans: It is because the earthquakes are shock waves which damage the foundations of the buildings.


5. 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. Photograph Name of the Feature Type (Erosional or Depositional or Both)

Photograph

Name of the Feature

Type

(Erosional or Depositional or Both)

Waterfall



Meander



Flood Plain




Ans:
 

Photograph

Name of the Feature

Type

(Erosional or Depositional or Both)

Waterfall

Waterfall

Erosional

Meander

Meander

Erosional and Depositional

Flood Plain

Flood Plain

Depositional



6. Solve the crossword puzzle with the help of given clues.


the crossword puzzle


Across


2. Loop Loop like the bend of a river

4. Solid form of water 

7. Moving mass of ice 

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

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

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

13. Large body of sea water 

14. Dry area where sand dunes are found 

15. Small hill of sand caused by the action of the wind 

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


Down


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

3. Flow of water in a channel 

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

6. Debris of boulder and coarse material carried by glacier 

8. Crescent shaped lake formed by a meandering river 

10. Fine sand deposited by the action of the wind 

13. Isolated mass of rising steep rock near a coastline 

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

Ans:

the crossword puzzle with answers


Topics Covered in Geography Class 7 Chapter 3 Our Changing Earth

S.No.

Topics of Our Changing Earth

1

Major Land Forms

  • Work of a River

  • Work of Sea Waves

  • Work of Ice

  • Work of Wind



Benefits of Referring to Chapter 3 Our Changing Earth Class 7 Questions and Answers

  • By referring to Class 7 Geography Chapter 3 Question Answer students can easily grasp the basic concepts of how natural forces change the Earth's surface.

  • Class 7 Geography Chapter 3 Questions and Answers PDF breaks down the complex processes like earthquakes, volcanoes, and weathering into easy-to-understand explanations.

  • Students can relate each and every concept of Our Changing Earth easily with the help of Ncert Geography Class 7 Chapter 3 PDF which includes examples from real life. 

  • Class 7 Geography Chapter 3 Questions and Answers includes diagrams to visually explain how these natural events occur and affect the Earth makes students learn interestingly.

  • The Chapter 3 Geography Class 7 makes learning about Earth's changes interesting and easy to understand through simple language and relatable content.


S.No.

Important Study Materials Links for Geography Class 7 Chapter 3

1

Class 7 Our Changing Earth Revision Notes

2

Class 7 Our Changing Earth Important Questions


Conclusion

NCERT Solutions for Class 7 Geography Chapter 3 - Our Changing Earth by Vedantu provides a comprehensive understanding of how natural forces shape our planet. Class 7 Geography Chapter 3 Question Answer offers clear and simple explanations of important concepts like earthquakes, volcanoes, and weathering, making them easy to grasp. Students should focus on understanding these key processes and their impacts on the Earth's surface. Detailed answers that are there in Class 7 Geography Chapter 3 Questions and Answers PDF are referred from textbook questions that help students to reinforce learning and ensure thorough preparation for exams. Visual aids like diagrams and real-life examples make the content engaging and relatable. Overall, these solutions help build a strong foundation in geography, boost confidence, and improve exam performance. By focusing on the main topics and utilizing the detailed explanations, students can effectively grasp the dynamic processes that constantly change our Earth.


Dive into our FREE PDF links offering chapter-wise NCERT solutions prepared by Vedantu Experts, to help you understand and master the social concepts.



Other Book-wise Links for Class 7 Social Science Solutions

S. No

NCERT Class 7 Social Science Book-wise Links

1

Class 7 History - Our Past II

2

Class 7 Civics - Social and Political Life-II


Important Related Links for NCERT Class 7 Geography

WhatsApp Banner

FAQs on NCERT Solutions For Class 7 Social Science Our Environment Chapter 3 Our Changing Earth - 2025-26

1. Where can I find clear and correct NCERT Solutions for Class 7 Social Science Chapter 3, 'Our Changing Earth'?

You can find reliable and easy-to-understand NCERT Solutions for Class 7 Social Science Chapter 3 right here on Vedantu. All answers are prepared by subject experts and are fully aligned with the latest CBSE 2025-26 syllabus to help you score better in exams.

2. How should I structure my answer for the textbook question on endogenic and exogenic forces?

To answer this question correctly, you should first define each force.

  • Start by explaining that endogenic forces are those that act in the interior of the Earth, like earthquakes and volcanoes.
  • Then, explain that exogenic forces work on the surface of the Earth, such as the work of wind and water.
Using simple examples for each, as shown in the textbook, will make your answer complete.

3. What key safety points from Chapter 3 should I include when answering the NCERT question on earthquake preparedness?

When solving the question on earthquake safety, make sure to list these key points from the chapter:

  • Finding a safe spot, like under a kitchen counter or desk, and staying away from corners.
  • Staying away from things that can fall, such as mirrors, picture frames, and windows.
  • If outdoors, moving to an open area away from buildings, trees, and power lines.
These points directly address the safety measures discussed in the chapter.

4. What is the correct method to explain the formation of a meander and an ox-bow lake for the Chapter 3 exercises?

For the best score, you should explain this in steps. First, describe how a river entering a plain twists and turns, forming large bends called meanders. Next, explain that due to continuous erosion and deposition, the ends of the meander loop get closer. Finally, state that over time, the river cuts through the narrow neck of land, leaving the old meander loop behind to form a cut-off lake, known as an ox-bow lake.

5. Why is it important to mention the movement of molten magma when explaining how lithospheric plates move in the NCERT solution?

It's crucial because the movement of molten magma inside the Earth is the direct cause of the plate movement. The NCERT solution explains that this magma moves in a circular manner, creating currents that push the lithospheric plates. Forgetting to mention the magma would leave your answer incomplete as it fails to explain the root cause of the Earth's surface changes.

6. How do the NCERT Solutions for Class 7 Social Science Chapter 3 explain the work of wind in deserts?

The solutions explain that wind is a major agent of erosion and deposition in deserts. It erodes the lower section of rocks more than the upper part, creating mushroom rocks. When the wind blows, it transports sand and deposits it in low, hill-like structures called sand dunes when the wind speed decreases. This process clearly shows how wind shapes the desert landscape.

7. What is the main difference between how a river and a sea wave create landforms, according to the solutions for this chapter?

The main difference lies in the process and location. A river creates landforms like waterfalls and meanders through erosion and deposition along its path on land. In contrast, sea waves create coastal landforms like sea caves, sea arches, and stacks by constantly striking against rocks along the coast. The river's work is inland, while the sea waves' work is strictly coastal.

8. Why do the solutions often suggest using diagrams when answering questions about landforms from this chapter?

Using simple, labelled diagrams for landforms like a waterfall, an ox-bow lake, or a mushroom rock is highly recommended. A diagram makes your answer much clearer and helps the examiner understand that you have properly grasped the concept. It is a very effective way to score higher marks for questions on geographical formations as per the CBSE pattern.