2 Objectives Describe how water is distributed on Earth Describe what powers the water cycle and how water moves through the cycle
3 Distribution of Earth’s Water Most of Earth’s water is salt water97% is ocean water (salt water)3% is freshwater (water with not salt)The majority of Earth’s freshwater is stored in ice caps and glaciers
4 Distribution of Earth’s Water Earth’s water is stored in reservoirs such asocean, glacier, pond, or even the atmosphere.
5 The Hydrologic CycleWater is the only molecule on Earth and any other planet that is present in all three states of matter.Solid (Ice and snow)Liquid (water)Gas (water vapor)
6 The Hydrologic CycleEarth’s water is present in all three states, it can get into a variety of environments around the planet.The movement of water around Earth’s surface is the hydrologic (water) cycleThe water cycle has no beginning or end it is a continuous cycle.
7 The Hydrologic CycleThe water cycle can be broken down into three stepsEvaporation: Water turns from a liquid to a gasCondensation: Water vapor condenses into water dropletsPrecipitation: Water droplets grow bigger from colliding and falls from the cloudsSnow, rain, hail, or sleet
9 People and Water People also depend on water as a natural resource. Not content to get water directly from streams or ponds, humans create canals, aqueducts, dams, and wells to collect water and direct it to where they want it
10 Water Use Water Use Use United States World (Global) Agriculture 34 70 Domestic1210Industry520Power Plant Cooling49>1