Water Resources Uses of water include agricultural,industrial,household. recreational and environmental activities. Virtually all of these human uses require fresh water. 97%of the water on the Earth is salt water. ● only 3%is fresh water. slightly over two thirds of this is frozen in glaciers and polar ice caps. The remaining unfrozen freshwater is found mainly as groundwater, with only a small fraction present above ground or in the air.Water Resources • Uses of water include agricultural, industrial, household, recreational and environmental activities. • Virtually all of these human uses require fresh water. • 97% of the water on the Earth is salt water. • only 3% is fresh water. • slightly over two thirds of this is frozen in glaciers and polar ice caps. • The remaining unfrozen freshwater is found mainly as groundwater, with only a small fraction present above ground or in the air