Question

why is there shortage of drinking water when three fourth of the Earth is covered with water

Answer 1

Reason is so because the Earth's surface has water which is salty and not consumables by us... only 1% of almost most of the water is pure...

that's the answer
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Answer 2

there is a shortage of drinking water because most of the water of the earth is oceanic water and cannot be consumed because it is salty.
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