Introduction
Evaporation
Transpiration
Sublimation
Condensation
Precipitation
Runoff
Groundwater
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Condensation

As water vapor moves through the atmosphere it loses energy and cools down. Once the vapor has cooled down enough it will be able to return to a liquid state. Particles of dust in the air act as condensation nuclei, places where molecules of water vapor can collect and turn back into liquid. Clouds are pockets of condensed water. When enough water has condensed, precipitation can occur.

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Condensation of clouds over the Rocky Mountains