Rainfall is part of the water cycle – warm air rises, the air is cooled to the point of condensing into liquid, and then rains back down to earth. Mountains FORCE air to rise, stimulating the water cycle and therefore stimulating more rain.
Also, rain mostly happens on one side of the mountain. When air travels up the mountains, it cools and condenses, causing rainfall. The air that travels back down the other side over the mountian is much drier iar, as it was lost most of its moisture by now. As such, much less rrainfall occurs on the other side of the mountain.
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