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The Hydrologic Cycle
  
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Kam IIIby Kirt Edblom on Flickr

The Sun's heat provides energy to EVAPORATE water from the Earth's surface (oceans, lakes, etc.)
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Dew droplets on a green leaf, nature after the rainby Ivan Radic on Flickr

The water vapor eventually CONDENSES, forming tiny droplets in clouds. 
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Taroko , Taiwanby cattan2011 on Flickr

Water continues to evaporate in the cool air, forming clouds. The clouds are formed by evaporated water vapors (gas) that condense and eventually lead to precipitation.  
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Poor visibility due to water flowing down the car's windshield. Driving in heavy rainby Ivan Radic on Flickr

When the clouds meet cool air over land, PRECIPITATION (rain, sleet, or snow) is triggered, and water returns to the land (or sea). Some of the precipitation soaks into the ground.
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Wet Village, Ugandaby Rod Waddington on Flickr

Some of the precipitation soaks into the ground. 
Some of the underground water is trapped between rocks or clay layers; this is called groundwater. 
Most of the water flows downhill as RUNOFF (above ground or underground), eventually returning to the seas as slightly salty water. 
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rain clouds over the Salish Seaby marneejill on Flickr

THE WATER CYCLE STARTS ALL OVER AGAIN!
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