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If surface air has very high relative humidity, why can cloud base form lower?

Answer and explanation

Correct answer: Less cooling is needed to reach saturation

Correct answer: A, less cooling is needed to reach saturation. Relative humidity compares the water vapour actually present with the maximum amount the air can hold at that temperature. When relative humidity is already high, the air is close to saturation. As moist air rises, it cools; only a small amount of additional cooling is then needed for condensation to begin. Condensation occurring at a lower height means the cloud base can be lower. B is wrong because high relative humidity means water vapour is present. C is wrong because high humidity brings air closer to, rather than farther from, condensation. D is wrong because clouds form from condensed water droplets or ice crystals around suitable particles, not rocks. Memory cue: higher humidity means a shorter journey to saturation and often a lower cloud base.

Related tags

Relative HumidityCloud BaseSaturationCondensationClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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