2. Answer to the question
1. Read the following passage carefully and then answer of the questions given below:
The world is not only hungry but also thirsty for water. This may seem strange to you. Since nearly 75 percent of the earth's surface is covered with water. But about 97 percent of this huge amount is sea water or salt water. Man can only drink and use the other 3 percent, the fresh water that comes from rivers, lakes, under ground and other sources. And we cannot even use all of that because some of it is in the form of icebergs and glaciers. Even worse, some of it has been polluted.
However, this small amount of fresh water which is constantly being replaced by rainfall is still enough for us. But our need for water is increasing rapidly almost day by day. Only if we take steps to deal with this problem now we can avoid a severe worldwide water shortage later on. A limited water supply would have a bad effect on agriculture and industry. Let me give you just one example of how necessary water to industry. Do you know that to produce a single ton of steel, it takes about 91000 liters of water?
We all have to learn how to stop wastage of our precious water. One of the first steps we should take is to develop ways of reusing it. Experiments have already been done in this field but only on a small scale. The systems that have been worked out resemble those uses in spacecraft.
Question:
(i) Why cannot we use all of the earth's fresh water?
(ii) How is the amount of fresh water replaced?
(ii) Why is our need for water rapidly increasing?
(iv) Where does the fresh water come from?
(v) How can we stop wastage of fresh water?
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