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In orographic rainfall, if air is already dry, why will rain remain limited despite increased height?

Answer and explanation

Correct answer: There will not be enough water vapour for condensation

Correct answer: D, there will not be enough water vapour for condensation. Orographic rainfall occurs when moist air is forced to rise along a mountain slope. Rising air cools, water vapour condenses, and clouds and precipitation may develop. However, if the air has already lost much of its moisture or is initially dry, further lifting cannot create a large supply of water vapour. There may be some cooling, but limited vapour means limited condensation and rainfall. A is wrong because rising air generally cools under ordinary atmospheric conditions, rather than always warming. B is wrong because air is present over mountains. C is wrong because dry air does not guarantee heavy rain. Memory cue: uplift helps only when moisture is available; no moisture means little condensation.

Related tags

Orographic RainfallDry AirWater VapourCondensationClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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