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The water cycle, also known as the hydrologic cycle or the H2O cycle, describes the continuous movement of water on, above and below the surface of the Earth.
It is constantly changing its form. The movement of water is referred to as the hydrologic or water cycle. Precipitation, evaporation/transpiration and runoff (surface runoff and subsurface infiltration) are the primary phases in the cycle.his web page is intended to help Californians identify their source(s) of drinking water, learn more about how drinking water is treated, and learn how to help prevent pollution of our groundwater and surface water supplies.