If you live in the United States, there are 40 trillion gallons of water above your head on an average day. Each day, about four trillion gallons of this water fall to Earth as precipitation, such as rain, snow, or hail. Some of the water that falls to Earth soaks into the ground and provides runoff to rivers, lakes, and oceans. The remainder—more than 2.5 trillion gallons—returns to the atmosphere through evaporation, and the process begins again. read more ...
an earlier attempt to explain rain from clouds - 'Being on Cloud Nine'.
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