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2. Borewell is a natural source of water.

3. Reservoirs are man-made lakes.

4. Boiling water kills the germs in it.

5. Water-borne diseases are caused by drinking filtered water.

IV. Answer the following questions in two or three sentences.

1. What are natural sources of water?

2. What is groundwater?

3. What is inland water?
4. What happens when we boil water?

5. What is filtration? Why do we filter water?

V. Answer the following questions in three to six sentences.
1. List the uses of water.

2. What are dams, reservoirs and canals?

3. Why should we purify water? What is water purification?

4. How is water purified?

5. Write about water-borne diseases.

Let’s Communicate

Some fruits and vegetables have water inside them. Name any five such fruits

and vegetables.

H TS Critical Thinking

We are all aware that seawater is quite salty. However, seawater is used in

some regions when water is scarce. Then how is seawater used?

Know More

Alum, also known as aluminium sulphate or phitkari, is a translucent
salt-like material that is often used in water treatment plants

to clarify water. It has been used since ancient times to remove
undesirable colour and roughness from water. It is used in filtration in traditional
water treatment plants around the world.

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