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Why does relative humidity of descending leeward air decrease after windward rainfall?

Answer and explanation

Correct answer: Because air warms and moisture has already decreased

Correct answer: A. Moist air rises on the windward side of a mountain, cools, condenses, and often loses water through precipitation. After crossing the summit, the air descends on the leeward side. Descending air is compressed by increasing atmospheric pressure and therefore warms. At the same time, much of its moisture has already been removed as rain or snow on the windward slope. Warmer air can hold more water vapour before becoming saturated, while the actual moisture supply is reduced, so relative humidity falls. Option A correctly combines both causes. B is wrong because descending air is not always saturated. C is wrong because moisture generally does not increase after windward rainfall. D is incomplete and incorrect; the mountain forces uplift and changes airflow but does not simply stop the air. Memory cue: wet ascent, dry descent—the rain-shadow sequence.

Related tags

Rain ShadowRelative HumidityLeeward SlopeHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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