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If droplets grow but the lower air is very dry, why can surface rainfall reduce?

Answer and explanation

Correct answer: Falling drops may partly or fully evaporate

Correct answer: A. Droplets may grow inside a cloud, but they still have to travel through the air before reaching the ground. When the air below the cloud is very dry, it can take up water vapour from the falling droplets. The droplets therefore become smaller, and some may disappear completely before reaching the surface. Precipitation that evaporates before reaching the ground is often called virga when it is visible as streaks beneath a cloud. B is impossible in this atmospheric process because water droplets do not turn into rocks. C is wrong because dry air tends to remove water from droplets rather than strengthen rainfall. D is wrong because evaporation and condensation are directly connected with precipitation. Memory cue: cloud growth does not guarantee ground rain; always check the air beneath the cloud.

Related tags

VirgaDry Lower AirPrecipitation EvaporationHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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