Tick the correct Answer. Mushroom rocks are found in: (a) Deserts (b) River valleys (c) Glaciers

Our Environment

Book: Our Environment

Chapter: 3. Our Changing Earth

Subject: Social Science - Class 7^th

Q. No. 2 of Exercise

Listen NCERT Audio Books - Kitabein Ab Bolengi

2

Tick the correct Answer.
Mushroom rocks are found in:

(a) Deserts

(b) River valleys

(c) Glaciers

As strong winds blow in the deserts, they erode the rocks present in these areas. They erode the sides of the rocks, they blow giving the rock shape like a mushroom.

2

1

Why do the plates move?

1

What are exogenic and endogenic forces?

1

What is erosion?

1

How are flood plains formed?

1

What are sand dunes?

1

How are beaches formed?

1

What are ox-bow lakes?

2

Tick the correct Answer.
Which is not an erosional feature of sea waves?

(a) Cliff

(b) Beach

(c) Sea cave

2

Tick the correct Answer.
The depositional feature of a glacier is:

(a) Flood plain

(b) Beach

(c) Moraine

2

Tick the correct Answer.
Which is caused by the sudden movements of the earth?

(a) Volcano

(b) Folding

(c) Flood plain

2

Tick the correct Answer.
Mushroom rocks are found in:

(a) Deserts

(b) River valleys

(c) Glaciers

2

Tick the correct Answer.
Ox bow lakes are found in:

(a) Glaciers

(b) River valleys

(c) Deserts

3

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 bed rock

(h) Deserts

4

Give reasons
Some rocks have a shape of a mushroom.

4

Give reasons
Flood plains are very fertile.

4

Give reasons
Sea caves are turned into stacks.

4

Give reasons
Buildings collapse due to earthquake Give reasons.

5

Activity.
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.

6

For fun.
Solve the crossword puzzle with the help of given clues.

Across

2. Loop like bend of river

4. Solid form of water

7. Moving mass of ice

9. Sudden descent of water in bed of river

11. Natural cavity on weak rocks formed by action of waves

12. Embankment on river that keeps river in its channel

13. Large body of sea water

14. Dry area where sand dunes are found

15. Small hill of sand piled by action of 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 channel

5. Steep perpendicular face of rock along sea coast

6. Debris of boulder and coarse material carried by glacier

8. Crescent shaped lake formed by river meander

10. Fine sand deposited by action of wind

13. Isolated mass of rising steep rock near coastline

14. Alluvial tracts of land at mouth of river formed by river deposits