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Our Changing Earth Class 7 Questions and Answers to difficult questions here. You will use them to help you in your exam preparation. NCERT Solutions for Class 7 Social Science Chapter 3 And you will get information about all these subjects NCERT Solutions for Class 7 Social Science Geography Chapter 3 Our Changing Earth Familiarises Reading Sharing about the Motions of the Earth which introduces you to the questions.
NCERT Solutions for Class 7 Geography Chapter 3 Our Changing Earth
Use the Class 7 SST Geography Chapter 3 NCERT Solutions and get to know the different concepts involved Make your learning experience enjoyable by preparing Read this post completely and try to solve it yourself and then see the answer. NCERT Solutions for Class 7 Social Science Chapter 3 On The Trial of the Earliest People is here to cover all the latest syllabi in all this. Going by the NCERT Class 7 Geography Chapter 3 Questions and Answers it will be very easy for all students to appear for the exam.
Our Changing Earth Class 7 Questions and Answers Geography Chapter 3
Answer the following questions.
(i) How are floodplains formed?
(ii) What are sand dunes?
(iii) Why do the plates move?
(iv) How are beaches formed?
(v) What are oxbow lakes?
(vi) What are exogenic and endogenic forces?
(vii) What is erosion?
(i) Layer of the fine soil and other material called sediments are deposited on the bank of the river during the floods. Gradually, this leads to the formation of plains.
(ii) When the wind stops blowing, the sand falls and gets deposited in the low hill like structures. These are called sand dunes.
(iii) Plates move because of the movement of the molten magma inside the earth.
(iv) Beaches are formed when the ocean waves deposit sediments along the shores of the sea.
(v) When the meander loop cuts off from the river and forms a cut off lake, also called an ox bow lake.
(vi) Endogenic forces: The forces that act in the interior of the earth are called endogenic forces. Exogenic forces: The forces that act on the surface of the earth are called exogenic forces.
(vii) Erosion is the wearing away of the landscape by different agents like water, wind and ice.
Tick the correct answer.
Question (i) Which is not an erosive feature of sea waves?
(c) Sea caves
Answer: (a) Cliff
Question (ii) The depositional feature of a glacier is :
(a) Flood plain
Answer: (c) Moraine
Question (iii) Which are caused by the sudden movements of the earth?
(c) Flood plain
Answer: (a) Volcano
Question (iv) Mushroom rocks are found in :
(b) River valleys
Answer: (a) Deserts
Question (v) Oxbow lakes are found in :
(b) River valleys
Answer: (b) River valleys
3. Match the following.
|Column I||Column II|
|1. Glacier||(a) Sea shore|
|2. Meanders||(b) River of ice|
|3. Beach||(c) Rivers|
|4. Sand Dunes||(d) Vibrations of earth|
|5. Waterfall||(e) Hard bedrock|
|6. Earthquake||(f) Deserts|
- i) Sea caves are turned into stacks.
- ii) Some rocks have the shape of a mushroom.
- iii) The floodplains are very fertile.
- iv) Building collapses due to earthquakes.
(i) Sea caves are turned into stacks, the reason being that sea waves continually strike at the rocks and thus cracks are developed. Over time, they become bigger and wider. Thus, hollow like caves are formed on the rocks. These are called sea caves. As these cavities become bigger and bigger, only the roof of the caves remain, thus forming sea arches. Further, erosion breaks the roof and only wall is left. These walls like features are called stacks and thus sea caves are turned into stacks.
(ii) Winds erode the lower section of the rock more than the upper portion. Hence, such rocks have narrower base and wider top which take the shape of a mushroom.
(iii) At times the river overflows its banks. This leads to the flooding of the neighboring areas. As it floods, it deposits layers of fine soil and other materials called sediments along its banks. This leads to the formation of a flat fertile floodplain.
(iv) The building collapses due to earthquakes because when the Lithospheric plates move, the surface of the earth vibrates. Greatest damage is usually closest to the epicentre. An earthquake over 5.0 can cause damage by falling things. A 6.0 or greater is considered very strong. The building may collapse due to a frequency over 5.0 on the Richter scale. Apart from this, sometimes the buildings are not constructed safely in view of the earthquakes. Hence, building collapses occur due to a low frequency of earthquakes.
Question 5. Observe the pictures given below. These are the various features created by a river. Identify them and also tell if they are erosional or depositional or landforms formed by both.
NCERT Solutions for Class 7 Social Science Geography Chapter 3 Our Changing Earth PDF
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