Answer:
As a cloud goes over a mountain, it rises. As air rises, it expands because there is less atmospheric pressure at higher altitudes. ... Cool air holds less mois- ture, rain falls and the cloud loses moisture. After it passes over the mountain, it drops down in elevation and the air becomes compressed and becomes warmer.
Mountains can have a significant effect on rainfall. When air reaches the mountains, it is forced to rise over this barrier. As the air moves up the windward side of a mountain, it cools, and the volume decreases. As a result, humidity increases and orographic clouds and precipitation can develop.
Explanation:
Hope this helps!
-Madeline
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