3
On the earth, the percentage of water, that is fresh and readily available for use,
is, nearly-
99.7%
97%
3%
0.3%
One of the important factors, that can lead to a scarcity of water, is -
excessive rainfall
afforestation
deforestation
processing of sea water
5.
'Waste water' is also called
sewage
potable water
water table
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Answer:
70% of the earth surface is covered with water, which amounts to 1400 million cubic kilometres (m km3). However, 97.5% of this water being sea water, it is salty. Fresh water availability is only 35 m km3. Out of the total fresh water, 68.7% is frozen in ice caps, 30% is stored underground and only 0.3% water is available on the surface of the earth. Out of the surface water, 87% is stored in lakes, 11% in swamp and 2% in rivers. As all the sweet water is not extractable, only 1% of the total water can be used by human beings (Anon. 2006).
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