people manage to survive for weeks without eating, but water is essential. Your body stop function properly after only seventy-two hours without drinking liquid Therefore, the supply of fresh water is extremely important to our planet. Every society on earth recognize importance of water, as observed in their religions, art, and literature
Of cause, not all of the water on our planet is drinkable. Ocean water salty; considerable
water is locked in massive glaciers and lage quantities of water vapor