Rain is a type of precipitation, a product of the condensation of
atmospheric water vapour that is deposited on the earth's surface. It
forms when separate drops of water fall to the Earth's surface from
clouds. Not all rain reaches the surface; some 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.
How rain is formed Rain plays a role in the hydrologic cycle in which
moisture from the oceans evaporates, condenses into drops, precipitates
(falls) from the sky, and eventually returns to the ocean via rivers and
streams to repeat the cycle again. The water vapor from plant respiration
also contributes to the moisture in the atmosphere.
A major scientific explanation of how rain forms and falls is called the
Bergeron process. More recent research points to the influence of Cloud
condensation nuclei released as the result of biological pr
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