Answer the following questions in brief :
1.How much surface of the earth is covered by ocean water?
2.Name three fresh water resources.
3.What is the result of ecological imbalance?
4.What makes rain water acidic?
5.How can we save water?
6.What is potable water?
7.Why we should not allow water to stagnate in old, broken containers?
8.Name three methods of purification of water.
9.Write three methods of safe handling and storage of water.
10.What do you mean by polluted water?
11.What do you mean by water pollution?
12.Name some diseases caused by drinking polluted water?
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