Earth’s FreshwaterWater on Earth

ObjectivesDescribe how water is distributed on Earth

Describe what powers the water cycle and how water moves through the cycle

Distribution of Earth’s WaterMost 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

Distribution of Earth’s WaterEarth’s water is stored in reservoirs such as

ocean, glacier, pond, or even the atmosphere.

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)

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.

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 clouds Snow, rain, hail, or sleet

The Hydrologic Cycle

People and WaterPeople 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

Water UseWater Use

Use United States World (Global)

Agriculture 34 70

Domestic 12 10

Industry 5 20

Power Plant Cooling

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