The rain shadow effect is a climatic phenomenon where one side of a mountain range receives significantly more precipitation than the other. This occurs because moist air ascends the windward side of the mountains, cooling and condensing into rain or snow, while the leeward side experiences drier conditions as the air descends, leading to arid or semi-arid environments. This process highlights the impact of topography on climate zones and can lead to environmental challenges like desertification and altered ecosystems.
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