Water, Water Everywhere Facts about water and the water cycle Tools A B Water's chemical name H20 Percent of fresh water on earth 3% Percent of water in oceans 97% Percent of water in human body 65% Percent of water in potato 80% Average consumed in lifetime 16,000 gallons Invisible water in air vapor As air cools vapor condenses Condensed vapor precipitation Sun's heat causes evaporation Cooled water vapor clouds Plants give out vapor transpiration Frozen condensed vapor snow Water wears away rock erosion Underground streams ground water No precipitation drought Frozen water expands Water as a solid ice water as a liquid water water as a gas vapor