Question

Only a small quantity of water present on the earth is useful .give reason?

Answer 1

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Plains occupy most of the land in India and it will be a fertile land and suitable for cultivation.

Plains are one of the major landforms on earth, where they are present on all continents, and would cover more than one-third of the world’s land area

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Answer 2

Because most of the water is either ocean water, or sewage water. We are using water injudiciously whenever it's available, as a result quality of water deteriorates everyday. So very little amount of water that's useful is present on earth.