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If rainfall is higher on the windward slope of a mountain, what is the correct reason?

Answer and explanation

Correct answer: Moist air rises and cools

Correct answer: A. This is orographic, or relief, rainfall. When moist air meets a mountain, the windward slope forces the air to rise. Rising air expands under lower pressure and cools. Cooling lowers the air’s capacity to hold water vapour; condensation then forms clouds and may produce rain on that slope. After crossing the crest, the air descends on the leeward side, becomes warmer by compression, and is often relatively drier, so rainfall is usually lower there. B describes descending and warming air, which is more characteristic of the leeward side, not the initial windward ascent. C is false because air is present and is moving up the slope. D is false because the Sun can shine on a windward slope; sunlight is not the main cause of this rainfall pattern. Memory cue: windward means “wind-facing”: moist air climbs, cools, condenses, and rains.

Related tags

Windward-SlopeOrographic-RainfallMountainsCondensationClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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