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Rain is a type of precipitation, a product of the condensation of atmospheric water vapor that is released on the Earth's surface. It forms when separate drops of water fall to the Earth from clouds. Not all rain reaches the surface; some of it evaporates while falling through dry air. When none of it reaches the ground, it is called virga, a phenomenon often seen in hot, dry desert regions. Rain is the primary source of fresh water for most areas of the world, providing suitable conditions for diverse ecosystems, as well as water for hydroelectric power plants and crop irrigation. The METAR code for rain is RA.
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