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If moist air rises on the windward slope of a mountain, what is the main reason for rainfall?

Answer and explanation

Correct answer: Air rises, cools, and condenses

Answer: B, air rises, cools, and condenses. Moist air is forced upward when it meets the windward side of a mountain. As air rises, pressure decreases and the air expands and cools. When it cools to its dew point, water vapour changes into tiny water droplets or ice crystals. These collect to form clouds; when the droplets or crystals become sufficiently large and heavy, they fall as rain or snow. A is wrong because descending air generally warms and dries, especially on the leeward side. C is wrong because moisture does not disappear; it changes form and may fall as precipitation. D is wrong because a mountain does not destroy vapour; it provides uplift that encourages condensation. Memory cue: windward means “wet-facing” side, while leeward is usually the drier rain-shadow side.

Related tags

Orographic RainfallWindward SlopeCondensationClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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