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What is the main cause of a rain shadow region?

Answer and explanation

Correct answer: Descending air beyond the mountain warms and becomes dry

The correct answer is B: descending air beyond the mountain warms and becomes dry. Moist air first rises on the windward side, cools, condenses, and often gives rain. After crossing the summit, the air descends on the leeward side. Descending air is compressed and warms, so its relative humidity falls and cloud formation becomes difficult. Therefore, the leeward side receives much less rain and is called a rain-shadow region. A is wrong because the windward slope commonly receives orographic rain. C is wrong because sea air can carry abundant moisture. D is wrong because clouds can form during both day and night. Memory cue: rising air cools and rains; descending air warms and dries.

Related tags

Rain ShadowLeeward SlopeOrographic RainfallClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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