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Rain is part of the hydrologic cycle. It is the result when the tiny water droplets grow too large for the rising air to support, and therefore fall to the earth. After the rain comes the water runoff into the streams, lakes and oceans.
From there, the water evaporates back into the atmosphere (or transpires from plants) where it then condenses into clouds which eventually causes rain again, completing the cycle.
Learn more about the hydrologic cycle in JetStream - An Online School for Weather.