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7. At night, land cools down much faster than _____________.
8. The amount of water vapour present in the atmosphere is known as _____________.

C. Label the diagrams.

D. Short Answer Questions.
1. What is chlorination?

2. Write two methods to purify water.
3. What do you mean by revolution?

4. What is sea breeze?

E. Long Answer Questions.

1. What is land breeze? How does it occur?
2. What causes day and night?

3. Differentiate between condensation and evaporation.

4. What is filtration? Why is purification of water necessary?

Think Hard

You must have seen rainwater falling off the roof of your house many times. Can you
think of at least two ways in which you can use this rainwater?

Project Work

Prepare a set up to show sedimentation and decantation.

Life Skills Activity

Find out any five water borne diseases, their causes, prevention and cure.

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