Question

Give reason: Though water covers 71% of the Earth, very little can be used by humans.

Answer 1

hey dear
here the answer for ur question

because the 71%of water is covers with salt water and remaining some amount of fresh water us available for drinking purpose and the other activities of human beings and animals so the very little amount of water can be used by human being and animals


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Answer 2

Even though Water covers 71 percent of the earth's total surface area, only very little can be used by humans because:

1) Around 97 percent of the total water present on the earth's surface is just saline water which cannot be treated manually and cannot be consumed by humans.

2) The left out 3 percent is freshwater found in the form of surface water and underground water and only surface water which accounts for about 63 percent of freshwater is used for human consumption.

3) The surface water has further sources of lake, rivers and swamps some of which is inaccessible. Therefore, only 0.3 percent of surface water is used for human use.