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Why can a rain-shadow area be dry?

Answer and explanation

Correct answer: Moisture can be lost on the windward slope, while descending air on the leeward side becomes warm and dry

Correct answer: A. When moist air meets a mountain, it is forced up the windward slope. Rising air expands and cools, causing condensation and precipitation on that side. After losing much of its moisture, the air crosses the ridge and descends the leeward slope. Descending air is compressed and warms, so its relative humidity falls and cloud formation becomes less likely. This dry leeward region is called a rain shadow. B is wrong because a rain-shadow area need not contain a sea. C is wrong because descending dry air usually suppresses cloud formation rather than making it compulsory. D is wrong because air is present and is moving across the mountain. Memory cue: windward side is wetter; leeward side lies in the rain shadow.

Related tags

Rain ShadowWindwardLeewardOrographic RainfallClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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