NCERT Solutions for Class 7 Geography Social Science Chapter 3 - Our Changing Earth
The Earth's movements are classified based on the driving forces behind them. Endogenic forces operate within the Earth, while exogenic forces affect the Earth's surface. Earthquakes and volcanic activities can result in substantial surface damage. The landscape undergoes continuous transformation due to weathering and erosion processes. These NCERT Solutions for Class 7 Geography offer comprehensive answers to all questions presented in the NCERT Class 7 Geography textbook.
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The NCERT Solutions for Class 7 Geography Social Science Chapter 3 - Our Changing Earth are tailored to help the students master the concepts that are key to success in their classrooms. The solutions given in the PDF are developed by experts and correlate with the CBSE syllabus of 2023-2024. These solutions provide thorough explanations with a step-by-step approach to solving problems. Students can easily get a hold of the subject and learn the basics with a deeper understanding. Additionally, they can practice better, be confident, and perform well in their examinations with the support of this PDF.
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Access Answers to NCERT Solutions for Class 7 Geography Social Science Chapter 3 - Our Changing Earth
Students can access the NCERT Solutions for Class 7 Geography Social Science Chapter 3 - Our Changing Earth. Curated by experts according to the CBSE syllabus for 2023–2024, these step-by-step solutions make SST- Geography much easier to understand and learn for the students. These solutions can be used in practice by students to attain skills in solving problems, reinforce important learning objectives, and be well-prepared for tests.
Our Changing Earth
Answer the following questions.
(i) Why do the plates move?
(ii) What are exogenic and endogenic forces?
(iii) What is erosion?
(iv) How are flood plains formed?
(v) What are sand dunes?
(vi) How are beaches formed?
(vii) What are the ox-bow lakes?
(i) The movement of molten magma inside the earth results in the movement of plates.
(ii) The movement of the Earth is divided on the basis of the forces which cause them. The forces that act in the interior of the earth are called endogenic forces, and the forces that work on the surface of the earth are called exogenic forces.
(iii) Erosion is defined as the wearing away of the landscape by different agents like water, wind and ice. The process of erosion and deposition creates different land-forms on the surface of the earth.
(iv) When a river overflows its banks, it results in the flooding of the area surrounding it. When it floods, it deposits a layer of fine soil and other material called sediments, thus forming a fertile layer of soil called flood plains.
(v) When the wind blows, it lifts and transports sand from one place to another. When the wind stops blowing, the sand falls and gets deposited in the low hill-like structures. These are called sand dunes. They are mostly found in desert areas.
(vi) The sea waves deposit sediments along the seashores. This results in the formation of beaches.
(vii) The sea waves deposit sediments along the seashores. This results in the formation of beaches.
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
(i) b
(ii) c
(iii) a
(iv) a
(v) b
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 bedrock |
|
|
(h) Deserts |
|
(i) Glacier |
(c) River of ice |
|
(ii) Meanders |
(d) Rivers |
|
(iii) Beach |
(a) Sea shore |
|
(iv) Sand dunes |
(h) Deserts |
|
(v) Waterfall |
(g) Hard bedrock |
|
(vi) Earthquake |
(e) Vibrations of earth |
Give reasons.
(i) Some rocks have the shape of a mushroom.
(ii) Flood plains are very fertile.
(iii) Sea caves are turned into stacks.
(iv) Buildings collapse due to earthquakes.
(i) Some rocks have the shape of a mushroom because, in deserts, wind erodes the lower section of the rock more than the upper section, which makes the base of the rock narrow and the upper part wide, giving it the shape of a mushroom.
(ii) Flood plains are very fertile because at times when river water overflows, it results in the flooding of the neighbouring areas. This deposits a layer of fine soil and other sediments on the banks of the river, which leads to fertile flood plains.
(iii) When the cavities in the sea caves become bigger and bigger, only the roof of the caves are leftover, which forms sea arches. Further, due to erosion, the roof vanishes and only the walls stay intact, turning the sea caves into stacks.
(iv) When the lithospheric plates move, the surface of the earth vibrates and then these vibrations travel outwards from the epicentre in the form of waves, which leads to sudden movement and results in the collapse of buildings.
Frequently Asked Questions
The NCERT solution for Class 7 Chapter 3: Our Changing Earth is important as it provides a structured approach to learning, ensuring that students develop a strong understanding of foundational concepts early in their academic journey. By mastering these basics, students can build confidence and readiness for tackling more difficult concepts in their further education.
Yes, the NCERT solution for Class 7 Chapter 3: Our Changing Earth is quite useful for students in preparing for their exams. The solutions are simple, clear, and concise allowing students to understand them better. They can solve the practice questions and exercises that allow them to get exam-ready in no time.
You can get all the NCERT solutions for Class 7 Geography Chapter 3 from the official website of the Orchids International School. These solutions are tailored by subject matter experts and are very easy to understand.
Yes, students must practice all the questions provided in the NCERT solution for Class 7 Geography Chapter 3: Our Changing Earth as it will help them gain a comprehensive understanding of the concept, identify their weak areas, and strengthen their preparation.
Students can utilize the NCERT solution for Class 7 Geography Chapter 3 effectively by practicing the solutions regularly. Solve the exercises and practice questions given in the solution.