Introduction
Evaporation
Transpiration
Sublimation
Condensation
Precipitation
Runoff
Groundwater
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Runoff

The movement of water across the surface of the Earth. There are two ways water can move across the land: sheet flow and channel flow. Sheet flow, or overland flow, is the movement of water across the entire surface of the land. This occurs during storms when the ground can no longer soak up any more water. Channel flow is the movement of water through a defined channel. Rivers and streams are types of channel flow.

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