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2. The earth’s crust is made up of huge slabs called ________________.
3. There are around ________________ active volcanoes in the world.

4. An ox-bow lake is a ________________ water body.
5. ________________ lies on the border of Zambia and Zimbabwe in Africa.
C. Match the following :
Column 'A' Column 'B'

1. Glacier (a) River of ice
2. Meanders (b) Vibration of earth

3. Waterfall (c) Fall at steep angle
4. Earthquake (d) Rivers

D. Write ‘T’ for true and ‘F’ for false :
1. The vibrations are called seismic waves.
2. The point where the earthquake originates inside the earth’s crust is called the epicenter.
3. Richter scale has range from 0 to 6.
4. River valleys are the most significant erosional landforms carved out by the rivers.
5. Dormant volcanoes are called ‘Sleeping Volcanoes’.

E. Answer these Questions :
1. What are ox-bow lakes?
2. What are lithospheric plates? Why do the plates move?
3. What are exogenic and endogenic forces?
4. Distinguish between tides and waves.
5. Write a short note on volcanoes.
6. How erosion and weathering are interlinked with each other? What type of coastal land forms
are formed of combined efforts of erosion and weathering?

Life Skills and Value (Activity)

• Collect the photographs of the erosional and depositional land forms formed by various geomorphic
agents. Now, paste these photographs on a chart and write their names and the geomorphic agent
against each photograph.

• Prepare a chart showing the endogenic and exogenic forces.

Social Studies
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