-
Q1 (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 ox bow lakes?Ans: (i) The plates move because of the molten magma which is present inside the earth.
(ii) The forces that act in the interior of the earth are known as exogenic forces.
(iii) Erosion is the wearing away of the landscape by different agents like water, wind, insects and ice etc.
(iv) When rivers outflow their banks, they cause flood in the neighbourhood areas. The flood water takes away good soil, another material and deposits them along in the banks. This deposition leads to the formation of flood plains.
(v) Winds lift and carry sand from one place to the other. When they stop blowing, sand falls and gets deposited in low hill like structure which are known as sand dunes.
(vi) The sea waves deposit sediments along the shores which leads to the formation of beaches.
(vii) When a river enters the plain it forms a large bend which is cut off stream in due course of time. The cut of stream takes the form of a lake which is called as ox-bow lake.
Q2 (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) DesertsAns: (i) (a) cliff
(ii) (c) moraine
(iii) (a) volcano
(iv) (a) deserts
(v) (b) river valleysQ3 (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) DesertsAns: (i) Glacier (c) river of ice
(ii) Meanders (g) hard bed rock
(iii) Beach (a) Sea shore
(iv) Sand dunes (h) deserts
(v) Waterfall (d) rivers
(vi) Earthquake (e) vibrations of earthQ4 (i) Some rocks have a shape of a mushroom.
(ii) Flood plains are very fertile.
(iii) Sea caves are turned into stacks.
(iv) Buildings collapse due to earthquakes.Ans: (i) In desert, wind is an active agent for soil erosion which erode the lower section of the rock more than the upper part of the rock. Therefore, some rocks have a shape of a mushroom which contain narrower base and wider top.
(ii) Flood plains are very fertile because floods deposit layers of fine soil and other material which is known as sediments which is ideal for cultivation along with its banks.
(iii) When cavities in sea caves become larger, only the roof of the caves remain forming sea arches. Further, erosion breaks the roof and only walls are left which forms the stacks.
(iv) During earthquakes, vibrations travel outwards from the epicenter as waves and propagate through the surface of the earth which produces sudden movements which leads to the collapse of buildings.
Q5 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.
Ans: name of the Features Type (erosional or Depositional or Both)
Waterfall both
Meander bothFlood plain depositional
Q6 
Ans: 1. Wave
2. Meander
3. River
4. Ice
5. Cliff
6. Moraine
7. Glacier
8. Oxbow lake
9. Waterfall
10. Loess
11. Cave
12. Levee
13. Sea
14. Desert
15. Sand dune
16. Floodplain
Our Changing Earth Question Answers: NCERT Class 7 Social Science - Our Environment (Geography)
Welcome to the Chapter 3 - Our Changing Earth, Class 7 Social Science - Our Environment (Geography) - NCERT Solutions page. Here, we provide detailed question answers for Chapter 3 - Our Changing Earth.The page is designed to help students gain a thorough understanding of the concepts related to natural resources, their classification, and sustainable development.
Our solutions explain each answer in a simple and comprehensive way, making it easier for students to grasp key topics and excel in their exams. By going through these Our Changing Earth question answers, you can strengthen your foundation and improve your performance in Class 7 Social Science - Our Environment (Geography). Whether you're revising or preparing for tests, this chapter-wise guide will serve as an invaluable resource.
Exercise 1 ( Page No. : 17 )
Key Features of NCERT Class 7 Social Science - Our Environment (Geography) Chapter 'Our Changing Earth' question answers :
- All chapter question answers with detailed explanations.
- Simple language for easy comprehension.
- Aligned with the latest NCERT guidelines.
- Perfect for exam preparation and revision.
Popular Questions of Class 7 Social Science - Our Environment (Geography)
- Q:-
Imagine an ideal environment where you would love to live. Draw the picture of your ideal environment.
- Q:-
(i) There is scanty vegetation in the deserts.
(ii) People of the Sahara desert wear heavy robes. - Q:-
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.
- Q:-
(i) Wet clothes take longer time to dry on a humid day?
(ii) Amount of insolation decreases from equator towards poles? - Q:-
(i) Ocean water is salty.
(ii) The quality of water is deterioting. - Q:-
(i) Sahara is located in which part of Africa
(a) eastern (b) northern (c) western
(ii) Sahara is what type of desert
(a) cold (b) hot (c) mild
(iii) The Ladakh desert is mainly inhabited by
(a) Christians and Muslims
(b) Buddhists and Muslims
(c) Christians and Buddhists
(iv) Deserts are characterised by
(a) scanty vegetation
(b) heavy precipitation
(c) low evaporation(v) Hemis in the Ladakh is a famous
(a) temple (b) church (c) monastery
(vi) Egypt is famous for growing
(a) wheat (b) maize (c) cotton - Q:-
(i) Name the continent in which the Amazon Basin is located.
(ii) What are the crops grown by the people of the Amazon Basin.
(iii) Name the birds that you are likely to find in the rainforests of the Amazon.
(iv) What are the major cities located on the River Ganga.
(v) Where is the one-horned rhinoceros found? - Q:-
(i) Which is not a natural ecosystem?
(a) Desert (b) Aquarium (c) Forest
(ii) Which is not a component of human environment?
(a) Land (b) Religion (c) Community
(iii) Which is a human made environment?
(a) Mountain (b) Sea (c) Road
(iv) Which is a threat to environment?
(a) Growing plant(b) Growing population (c) Growing crops - Q:-
(i) Which of the following gases protects us from harmful sun vays?
(a) Carbon dioxide (b) Nitrogen (c) Ozone(ii) The most important layer of the atmosphere is
(a) Troposphere (b) Thermosphere (c) Mesosphere(iii) Which of the following layers of the atmosphere is free from clouds?
(a) Troposphere (b) Stratosphere (c) Mesosphere(iv) As we go up the layers of the atmosphere, the pressure
(a) Increases (b) Decreases (c) Remains the same(v) When precipitation comes down to the earth in the liquid form, it is called
(a) Cloud (b) Rain (c) Snow - Q:-
(i) Today’s world is shrinking.
Recently Viewed Questions of Class 7 Social Science - Our Environment (Geography)
- Q:-
(i) We cannot go to the centre of the earth.
(ii) Sedimentary rocks are formed from sediments.
(iii) Limestone is changed into marble. - Q:-
(i) The name of one river is hidden in each of the sentences below. Spot it. Example:Mandira, Vijayalakshmi and Surinder are my best friends Answer: Ravi
(a) The snake charmer’s bustee, stables where horses are housed, and the piles of wood, all caught fire accidentally. (Hint: Another name for River Brahmputra)
(b) The conference manager put pad, material for reading and a pencil for each participant (Hint: A distributary on the Ganga-Brahmputra delta)
(c) Either jealousy or anger cause a person’s fall (Hint: Name of a juicy fruit!)
(d) Bhavani germinated the seeds in a pot (Hint: Look for her in West Africa)
(e) “I am a zonal champion now” declared the excited athlete. (Hint: The river that has the biggest basin in the world)
(f) The tiffin box rolled down and all the food fell in dusty potholes. (Hint: Rises in India and journeys through Pakistan)
(g) Malini leaned against the pole when she felt that she was going to faint. (Hint: Her delta in Egypt is famous)
(h) Samantha mesmerised everybody with her magic tricks. (Hint: London is situated on her estuary)
(i) “In this neighbourhood, please don’t yell! Owners of these houses like to have peace”. Warned my father when we moved into our new flat”. (Hint: colour!)
(j) ‘Write the following words, Marc!’ “On”, “go”, “in”........ said the teacher to the little boy in KG Class. (Hint: Rhymes with ‘bongo’) Now make some more on your own and ask your classmates to spot the hidden name. You can do this with any name: that of a lake, mountains, trees, fruits, school items etc. - Q:-
(i) Which of the following gases protects us from harmful sun vays?
(a) Carbon dioxide (b) Nitrogen (c) Ozone(ii) The most important layer of the atmosphere is
(a) Troposphere (b) Thermosphere (c) Mesosphere(iii) Which of the following layers of the atmosphere is free from clouds?
(a) Troposphere (b) Stratosphere (c) Mesosphere(iv) As we go up the layers of the atmosphere, the pressure
(a) Increases (b) Decreases (c) Remains the same(v) When precipitation comes down to the earth in the liquid form, it is called
(a) Cloud (b) Rain (c) Snow - Q:-
For fun.
(i) What are the minerals most commonly used in the following objects?
(ii) Identify some more objects made up of different minerals.
- Q:-
(i) What is an ecosystem?
(ii) What do you mean by natural environment?
(iii) Which are the major components of the environment?
(iv) Give four examples of human made environment.
(v) What is lithosphere?
(vi) Which are the two major components of biotic environment?
(vii) What is biosphere? - Q:-
(i) The process by which water continually changes its form and circulates between oceans, atmosphere and land
(a) Water cycle (b) Tides (c) Ocean currents
(ii) Generally the warm ocean currents originate near
(a) Poles (b) Equator (c) None of these
(iii) The rythmic rise and fall of ocean water twice in a day is called
(a) Tide (b) Ocean current (c) Wave - Q:-
(i) What are the four means of transport?
(ii) What do you understand by the term ‘settlement’?
(iii) Which are the activities practised by the rural people?
(iv) Mention any two merits of railways.
(v) What do you understand by communication?
(vi) What is mass media? - Q:-
(i) There is scanty vegetation in the deserts.
(ii) People of the Sahara desert wear heavy robes. - Q:-
(i) Toucans are a type of
(a) birds (b) animals (c) crops
(ii) Manioc is the staple food of
(a) Ganga Basin (b) Africa (c) Amazon
(iii) Kolkata is located on the river
(a) Orange (b) Hooghly (c) Bhagirathi
(iv) Deodars and firs are a type of
(a) Coniferous trees (b) Deciduous trees (c) shrubs
(v) Bengal tiger is found in
(a) mountains (b) delta area (c) Amazon - Q:-
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.
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