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Why is relative humidity often low in desert regions?

Answer and explanation

Correct answer: Air is dry and temperature is high

Correct answer: A, desert air is generally dry and temperatures are often high. Deserts usually have limited surface water and low precipitation, so evaporation does not supply enough moisture to keep the air near saturation. In addition, warm air has a greater capacity to hold water vapour than cool air. If the actual amount of vapour remains small while the possible holding capacity is large, relative humidity is low. Option B is incorrect because lakes are not present everywhere in deserts; widespread water bodies would usually add moisture. Option C is incorrect because daily rainfall is not a normal desert condition. Option D is incorrect because rapid condensation requires suitable cooling and moisture, neither of which is guaranteed. A low relative humidity also means the air can support faster evaporation when water is available. Memory cue: scarce water plus hot, dry air usually means low relative humidity.

Related tags

GeographyDesertRelative HumidityWater VapourHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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