What causes there to be more rain on side of a mountain than the other?



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    Mountains block the passage of water carrying weather systems.  Warm moist air forms over bodies of water and prevailing winds blow them towards land.   The Prevailing winds continue to push the warm moist air until they reach mountains.  As the air ascends up a slope they become cooler and the moistness condenses and precipitates on the windward side of the mountain. The result is a wet windward side and a dry leeward side. This is called a rain shadow.

    rainshadow diagram

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