the water cycle. the sun the sun provides the energy to power the water cycle the sun heats the...
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![Page 1: The Water Cycle. The Sun The sun provides the energy to power the water cycle The sun heats the upper ocean causing evaporation of liquid water into water](https://reader038.vdocuments.mx/reader038/viewer/2022103015/5517bace550346892b8b47cd/html5/thumbnails/1.jpg)
The Water Cycle
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The Sun• The sun provides the energy to power the
water cycle• The sun heats the upper ocean causing
evaporation of liquid water into water vapor
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• The water vapor rises into the atmosphere and cools
• The cooled water vapor creates tiny water droplets that form clouds
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• When clouds become too heavy with water droplets, precipitation falls– rain– sleet– snow– hail
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• Once water reaches the earth’s surface:– Infiltrates the surface (soaks in)– Runs across the top of the ground filling rivers,
lakes, and streams (can cause erosion)
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aquifer• A natural underground area where large
amounts of ground water collect and create an underground supply of water
• Amount of water stored depends on the porosity and permeability of the sediment
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porosity
• Amount of water that a material can hold in the spaces between the pores
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permeability
• The measure of how well an earth material can let water pass through it.
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percolation
• The downward movement of water from the land surface into soil or porous rock. It is caused by gravity
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infiltration
• When water enters the soil surface after falling from the atmosphere
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Surface water
• Water located on earth’s surface• Most US cities use surface water– rivers– lakes– streams– ponds– creeks– reservoirs
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ground water
• Water located under the ground surface• Reached by using wells• Cleaner and safer
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pollution
• Any change to the environment that has a negative effect on living things
• Water sources are especially sensitive to pollution
• Burning fossil fuels can create acid rain
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http://www.epa.gov/safewater/kids/flash/flash_watercycle.html
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Discussion Questions
Is there a beginning to the water cycle?
What is the power source for the water cycle?
How does water get into an aquifer?