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If air descends leeward after rainfall on windward slope why does its relative humidity decrease?

Answer and explanation

Correct answer: Because descending air warms and moisture has already decreased

Correct answer: A. Moist air rises on the windward side of a mountain, expands and cools, and condensation produces clouds and rainfall. Because some water has fallen out, the air crossing the crest contains less moisture. As this air descends on the leeward side, pressure increases and the air is compressed and warmed. Relative humidity compares the actual water vapour present with the maximum vapour the air could hold at its current temperature. Warming increases that capacity, while the actual moisture has already been reduced, so relative humidity falls and dry rain-shadow conditions develop. B is wrong because descending air need not remain saturated. C is incomplete and does not explain humidity. D is opposite to the usual process. Memory cue: rain removes moisture; descent warms air.

Related tags

Rain ShadowRelative HumidityLeewardClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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