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If droplets have grown but the lower air is very dry why can surface rainfall decrease?

Answer and explanation

Correct answer: Falling drops may partly or fully evaporate

Correct answer: A. A raindrop must travel through the air between the cloud and the ground. When this lower air is very dry, it can take up water vapour from the falling drops. As a result, the drops may become smaller, partly evaporate, or disappear before reaching the surface. The visible precipitation below the cloud can therefore decrease; precipitation that evaporates before reaching the ground is often called virga. Option A is correct because it connects dry air with evaporation during descent. Option B is wrong because water drops do not turn into rocks. Option C is wrong because dry air generally removes water from drops rather than increasing the amount reaching the ground. Option D is wrong because evaporation and water vapour are directly involved in precipitation. Memory cue: a cloud can be raining above while dry air makes the ground receive little or no rain.

Related tags

VirgaDry Lower AirPrecipitationHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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