NCERT Solutions for Class 7 Social Science (Geography) Chapter 3 Our Changing Earth
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Book Name: Our Environment
Subject: Geography
Chapter Number: 3
Chapter Name: Our Changing Earth
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Book Name: Our Environment
Subject: Geography
Chapter Number: 3
Chapter Name: Our Changing Earth
You can also bookmark this page by clicking + Save to Library icon and refer to these NCERT Solutions anytime from your account. More Detail
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Page 1
NCERT
SOLUTIONS
CLASS - 7TH
aglase .co
SOLUTIONS
CLASS - 7TH
aglase .co
Page 2
Book : Our Environment Ncert Solutions | Chapter-3 Geography
Class : 7th
Subject : Geography
Chapter : 3
Chapter Name : Our Changing Earth
Q1 Find out the names of a few rivers of the world that form a delta.
Answer. DIY
Page : 16 , Block Name : Let’s do
Q1 Answer the following questions.
(i) Why do the plates move?
(ii) What are exogenic and endogenic forces?
(iii) What is erosion?
(iv) How are �ood plains formed?
(v) What are sand dunes?
(vi) How are beaches formed?
(vii) What are ox-bow lakes?
Answer. (i) The Lithospheric plates move around because of the movement of the molten
magma inside the Earth.
(ii) Earth’s movements are divided on the basis of the forces which cause them. The ones
that work on the Earth’s surface are called exogenic forces while the ones that work in
the Earth’s interior are called endogenic forces. The erosional and depositional activities
of wind and water are examples of exogenic forces. Earthquakes and volcanoes are
examples of endogenic forces.
(iii) Erosion is the weathering or wearing away of the landscape by different agents like
wind, water and ice.
(iv) During its course through a plain, a river sometimes over�ows its banks. This leads
to the �ooding of the neighbouring areas. As it �oods, the river water deposits layers of
�ne soil and sediments on its banks. This leads to the formation of a �at, fertile �ood
plain.
(v) In deserts, when wind blows, it lifts and transports sand from one place to another.
When it stops blowing, the sand particles fall and get deposited in low hill-like structures
called sand dunes.
(vi) The erosional and depositional activities of the sea waves give rise to different
coastal landforms. A beach is one such coastal landform. It is formed when the sea waves
deposit sediments along the sea shore.
Page 1 of 8 Aglasem Schools
Class : 7th
Subject : Geography
Chapter : 3
Chapter Name : Our Changing Earth
Q1 Find out the names of a few rivers of the world that form a delta.
Answer. DIY
Page : 16 , Block Name : Let’s do
Q1 Answer the following questions.
(i) Why do the plates move?
(ii) What are exogenic and endogenic forces?
(iii) What is erosion?
(iv) How are �ood plains formed?
(v) What are sand dunes?
(vi) How are beaches formed?
(vii) What are ox-bow lakes?
Answer. (i) The Lithospheric plates move around because of the movement of the molten
magma inside the Earth.
(ii) Earth’s movements are divided on the basis of the forces which cause them. The ones
that work on the Earth’s surface are called exogenic forces while the ones that work in
the Earth’s interior are called endogenic forces. The erosional and depositional activities
of wind and water are examples of exogenic forces. Earthquakes and volcanoes are
examples of endogenic forces.
(iii) Erosion is the weathering or wearing away of the landscape by different agents like
wind, water and ice.
(iv) During its course through a plain, a river sometimes over�ows its banks. This leads
to the �ooding of the neighbouring areas. As it �oods, the river water deposits layers of
�ne soil and sediments on its banks. This leads to the formation of a �at, fertile �ood
plain.
(v) In deserts, when wind blows, it lifts and transports sand from one place to another.
When it stops blowing, the sand particles fall and get deposited in low hill-like structures
called sand dunes.
(vi) The erosional and depositional activities of the sea waves give rise to different
coastal landforms. A beach is one such coastal landform. It is formed when the sea waves
deposit sediments along the sea shore.
Page 1 of 8 Aglasem Schools
Page 3
Book : Our Environment Ncert Solutions | Chapter-3 Geography
(vii) An ox-bow lake is a crescent-shaped lake formed by a meandering river. During its
journey through a plain, a river twists and turns to form meanders. Erosion and
deposition occur constantly along the sides of a meander, thereby causing the ends of its
loop to come closer and closer. In due course of time, the meander loop cuts off from the
river and forms a cut-off, crescent-shaped ox-bow lake.
Page : 17 , Block Name : Exercise
Q2 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
Answer.
Page 2 of 8 Aglasem Schools
(vii) An ox-bow lake is a crescent-shaped lake formed by a meandering river. During its
journey through a plain, a river twists and turns to form meanders. Erosion and
deposition occur constantly along the sides of a meander, thereby causing the ends of its
loop to come closer and closer. In due course of time, the meander loop cuts off from the
river and forms a cut-off, crescent-shaped ox-bow lake.
Page : 17 , Block Name : Exercise
Q2 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
Answer.
Page 2 of 8 Aglasem Schools
Page 4
Book : Our Environment Ncert Solutions | Chapter-3 Geography
Page : 18 , Block Name : Exercise
Q3 Match the following.
Answer.
Page : 18 , Block Name : Exercise
Q4 Give reasons.
(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.
Answer. (i) In deserts, one can see rocks in the shape of a mushroom—with a narrower
base and a wider top. These are known as mushroom rocks. Such rocks are formed when
the winds erode the lower section of a rock more than the upper part.
(ii) Flood plains are formed as a result of the depositional activity of rivers. Rivers carry
along with them eroded material like �ne soil and sediments. When it over�ows its
Page 3 of 8 Aglasem Schools
Page : 18 , Block Name : Exercise
Q3 Match the following.
Answer.
Page : 18 , Block Name : Exercise
Q4 Give reasons.
(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.
Answer. (i) In deserts, one can see rocks in the shape of a mushroom—with a narrower
base and a wider top. These are known as mushroom rocks. Such rocks are formed when
the winds erode the lower section of a rock more than the upper part.
(ii) Flood plains are formed as a result of the depositional activity of rivers. Rivers carry
along with them eroded material like �ne soil and sediments. When it over�ows its
Page 3 of 8 Aglasem Schools
Page 5
Book : Our Environment Ncert Solutions | Chapter-3 Geography
banks, it deposits the eroded material and causes �ood plains to be formed. The
deposited material makes the land fertile.
(iii) Stacks are formed as a result of the erosional activity of the sea waves. When sea
waves continuously strike rocks, cracks develop in them. As these cracks become larger
and wider, hollow caves get formed on the rocks. These are called sea caves. As the waves
keep striking the rocks, the cavities become bigger and bigger, with only the roof
remaining at the end. Such structures are known as sea arches. Further erosion breaks
the roof, and only walls remain. These wall-like features are known as stacks. Thus, sea
caves are ultimately converted into stacks.
(iv) Earthquakes are the sudden vibrations caused within the Earth’s surface as a result of
the movement of the Lithospheric plates. Such vibrations, when they are of a high
intensity, cause damage to the things on the Earth’s surface. Various human-made (e.g.,
buildings) and natural (e.g., trees) constructions can break down and collapse under the
effect of the vibrations because they are situated on the Earth’s surface.
Page : 18 , Block Name : Exercise
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.
Page 4 of 8 Aglasem Schools
banks, it deposits the eroded material and causes �ood plains to be formed. The
deposited material makes the land fertile.
(iii) Stacks are formed as a result of the erosional activity of the sea waves. When sea
waves continuously strike rocks, cracks develop in them. As these cracks become larger
and wider, hollow caves get formed on the rocks. These are called sea caves. As the waves
keep striking the rocks, the cavities become bigger and bigger, with only the roof
remaining at the end. Such structures are known as sea arches. Further erosion breaks
the roof, and only walls remain. These wall-like features are known as stacks. Thus, sea
caves are ultimately converted into stacks.
(iv) Earthquakes are the sudden vibrations caused within the Earth’s surface as a result of
the movement of the Lithospheric plates. Such vibrations, when they are of a high
intensity, cause damage to the things on the Earth’s surface. Various human-made (e.g.,
buildings) and natural (e.g., trees) constructions can break down and collapse under the
effect of the vibrations because they are situated on the Earth’s surface.
Page : 18 , Block Name : Exercise
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.
Page 4 of 8 Aglasem Schools
Page 6
Book : Our Environment Ncert Solutions | Chapter-3 Geography
Answer.
Page 5 of 8 Aglasem Schools
Answer.
Page 5 of 8 Aglasem Schools
Page 7
Book : Our Environment Ncert Solutions | Chapter-3 Geography
Page : 18 , Block Name : Exercise
Q6 For fun.
Solve the crossword puzzle with the help of given clues.
Page 6 of 8 Aglasem Schools
Page : 18 , Block Name : Exercise
Q6 For fun.
Solve the crossword puzzle with the help of given clues.
Page 6 of 8 Aglasem Schools
Page 8
Book : Our Environment Ncert Solutions | Chapter-3 Geography
Page 7 of 8 Aglasem Schools
Page 7 of 8 Aglasem Schools
Page 9
Book : Our Environment Ncert Solutions | Chapter-3 Geography
Answer.
Page : 18 , Block Name : Exercise
Page 8 of 8 Aglasem Schools
Answer.
Page : 18 , Block Name : Exercise
Page 8 of 8 Aglasem Schools
Document Details
| Board / Org | NCERT |
| Exam | Class 7 |
| Type | Solution |
| Pages | 9 |
| Updated | 30 Apr 2026 |