Water cycle

"Water cycle, also called hydrologic cycle, cycle that involves the continuous circulation of water in the Earth-atmosphere system. Of the many processes involved in the water cycle, the most important are evaporation, transpiration, condensation, precipitation, and runoff. Although the total amount of water within the cycle remains essentially constant, its distribution among the various processes is continually changing" (Britannica 2020).
 

Sources

Britannica, T. Editors of Encyclopaedia. "Water cycle." Encyclopedia Britannica, May 27, 2020. https://www.britannica.com/science/water-cycle.
 

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