Why does it rain as air passes over the mountain

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:

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-Madeline

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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 moisture, 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.

Explanation:

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