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Why may clouds be fewer in a desert despite rapid evaporation?

Answer and explanation

Correct answer: Because total moisture availability and vertical cooling may be limited

Correct answer: A. Cloud formation needs more than rapid evaporation at a particular moment. There must be enough total moisture in the air, and the air usually needs to rise and cool until it reaches saturation or its dew point. Deserts may have intense heating and rapid evaporation from small amounts of available water, but the overall moisture supply is often limited. Dry descending air and weak or insufficient vertical cooling can also prevent saturation. A is correct. B is false because deserts receive strong sunshine. C is false because deserts have air and winds. D is false because evaporation supplies vapour for clouds, although it is not sufficient by itself. Memory cue: clouds need moisture plus cooling, not heat alone.

Related tags

DesertCloud FormationMoisture AvailabilityVertical CoolingHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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