Water on Earth. Objectives Describe how water is distributed on Earth Describe what powers the water...
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Transcript of Water on Earth. Objectives Describe how water is distributed on Earth Describe what powers the water...
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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