why is all water available on earth not usable??
explain it briefly..
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Oceans, which are the largest source of surface water, comprise approximately 97 percent of the Earth's surface water. However, since the oceans have high salinity, the water is not useful as drinking water. Efforts have been made to remove the salt from the water (desalination), but this is a very costly endeavor.
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Answer:
because 97 persent of water is salty and it's source is ocean
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