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The Water
Cycle
is constantly "reusing" the Earth's water and altering its form.
Water falls to the earth as precipitation in the form of rain, hail, sleet, or snow. Some precipitation is absorbed, but a great deal flows downhill
along the surface into rivers and streams and eventually into the ocean.
During its journey, or on the surface of a lake or river, some water
evaporates.
Some of the water that is absorbed by plants
transpires. During evaporation and transpiration, water vapor moves into the atmosphere where it cools and
condenses. Clouds form and the cycle begins all over again.
image courtesy of
Kids' Stuff Site
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Watersheds
> Water Cycle