Class 7 Geography (Our Environment) Chapter 3 Our Changing Earth - 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.
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!
Glance on NCERT Solutions for Class 7 Geography Chapter 3 - Our Changing Earth
Our Changing Earth Class 7 PDF covers essential topics like earthquakes, volcanoes, and weathering.
The dynamic processes that shape the Earth, including the formation and movement of continents, mountains, and oceans are clearly explained in Geography Class 7 Chapter 3.
One can learn the natural forces that constantly change the Earth's surface with the help of Ncert Geography Class 7 Chapter 3 PDF.
The formation of volcanoes and how they become active and their effects on the surroundings are detailed in Our Changing Earth Class 7 Questions and Answers.
The process of weathering is mentioned in Our Changing Earth includes how it breaks down rocks.
With the help of Our Changing Earth Class 7 PDF one can understand what causes earthquakes and how they impact the Earth.
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.
Ans:
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)
Ans:
6. Solve the crossword puzzle with the help of given clues.
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:
Topics Covered in Geography Class 7 Chapter 3 Our Changing Earth
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.
Important Study Material Links for Geography Class 7 Chapter 3 Our Changing Earth
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.
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FAQs on NCERT Solutions for Class 7 Social Science Geography Chapter 3 Our Changing Earth
1. What are the Different Types of Earth's Forces in Chapter 3 Geography Class 7?
There are different types of earth's forces. The NCERT class 7 of chapter 3 notes provides complete information on the same.
Earth's movements are divided according to the basis of the forces causing different issues.
Forces acting in the interior of the earth are called endogenic forces and those that work on the surface of the earth are called exogenic forces. In many cases, these endogenic forces produce sudden movements, and in some time, they produce slow movements. These sudden movements lead to volcanoes.
2. How to Prepare to be Safe During the Earthquake according to Class 7 Geography Chapter 3 Questions and Answers PDF?
An earthquake can take place anytime, and you need to be well prepared to ensure that there is no harm. Some of the ways to be protective are-
Find a safe spot at home like a kitchen counter, table or desk
Stay away from fireplaces and windows
Stay away from ceiling fans and hanging lights as they can fall easily
Reach out to the open space and be with the crowd
We should be able to face the disaster
3. What are the Coastal Processes Our Changing Earth Class 7 PDF?
Coastal zone is the part of the surface land, which is widely influenced by the marine process. Coastal zone plays an active part in the earth's surface, where marine and atmospheric processes produce coastal rocks, along with beaches and dunes. These coasts also support rich ecosystems like mangroves, coral reefs and salt marshes. Waves, on the other hand, provide half the energy at the cost. Ocean waves are usually generated through wind blowing. Stronger the wind, longer the waves blow.
4. What do you know about the lithospheric plates according to Chapter 3 of Class 7 Social Science?
When the regions of Earth's crust and upper mantle of the lithosphere are fractured into numerous plates, these plates are known as lithospheric plates. Now, due to the movement of molten magma inside Earth's crust, these plates also keep moving slowly. The changes caused on the surface of Earth are all due to the movement of these lithospheric plates. The sudden movements of these lithospheric plates destroy Earth in the form of Volcanoes, Earthquakes, etc.
5. How do the lithospheric plates move as discussed in Class 7 Geography Chapter 3 Question Answer?
Movements in the lithospheric plates occur due to heat produced in the Earth's core because of convection currents in the mantle part of the Earth. When the warmer material rises, the material which is colder sinks down, and this pattern of rising and sinking keeps on repeating over and over again, thus causing the lithospheric plates to rise and become a reason for their movement. To learn more about this chapter visit Vedantu’s website (vedantu.com). Any study material is available to download absolutely free of cost.
6. Explain the working of a river as explained in Chapter 3 of Class 7 Social Science.
The river's flowing water erodes the landscape. A waterfall is formed when a river flows at a steep angle over exceptionally hard rocks or down a deep valley side. The river twists and turns as it enters the plains, forming huge bends known as meanders. The ends of the meander loop are getting closer and closer due to constant erosion and deposition along the meander's sides.
The meander loop eventually separates from the river and forms a cut-off lake, also known as an ox-bow lake. The river occasionally breaches its banks, producing flooding in the surrounding areas. It deposits sediments along its banks as it floods, which are layers of fine dirt and other debris.
7. Give an account of the working of wind as discussed in Chapter 3 of Class 7 Social Science.
In deserts, the wind is a major cause of erosion and deposition. Mushroom rocks are rocks that have the shape of a mushroom and are commonly found in deserts. The lower section of the rock is eroded more by the wind than the higher section. As a result, such rocks have a smaller base and a larger top. The wind lifts and moves sand from one location to another when it blows.
Sand falls and is deposited in low hill-like structures when the wind stops blowing. They are known as dunes. When grains are very fine and light, they can be carried over long distances by the wind. Loess is the name given to sand that has been deposited over a broad area.
8. Give an account of earthquake preparedness according to Chapter 3 of Class 7 Social Science.
An earthquake is a natural disaster that we cannot prevent. However, if we are prepared ahead of time, we can lessen the impact. We should move to a safe location in the event of an earthquake. We should hide behind a kitchen counter, table, or desk against a door or a wall on the inside. We should avoid fireplaces, locations around chimneys, and windows with reflective surfaces, such as mirrors and picture frames. Furthermore, we should make our friends and family members aware of the situation.
9. What is the significance of learning about volcanoes in class 7 chapter 3?
Understanding volcanoes helps students learn about their formation, types of eruptions, and the impact on the environment.
10. What types of weathering are discussed in Class 7 Geography Chapter 3?
The chapter discusses physical (mechanical) weathering, chemical weathering, and biological weathering, explaining how each type breaks down rocks.
