The two important sources of water are surface water and ____ The ____ is the water above the ground. The ____ found beneath the Earth's surface The ____ is safe source of water and considered as the cleanest water The ground water is stored in underground layer called "____". The three different kinds of water are ____, ____ and ____ The ____ is salty and it has a large amount of salt. The ____ that is safe for drinking. The ____ that is safe not for drinking.

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