Introduction
Evaporation
Transpiration
Sublimation
Condensation
Precipitation
Runoff
Groundwater
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Precipitation

The transfer of water from the atmosphere back down to the surface of the Earth. Precipitation occurs when the atmosphere can no longer hold the condensed water. There are various reasons why the atmosphere can no longer hold any more water, from the air becoming saturated to a drop in the air temperature. When precipitation reaches the surface it can be intercepted by vegetation, infiltrate down into the ground, or run off of the surface.

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