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In which condition is virga more likely?

Answer and explanation

Correct answer: The lower air is dry and falling drops evaporate

Correct answer: B, the lower air is dry and falling drops evaporate. Virga is precipitation that falls from a cloud but evaporates or sublimates before reaching the ground. The decisive condition is a sufficiently dry layer beneath the cloud. As raindrops enter this layer, some of the surrounding air is not saturated, so water can evaporate; ice particles may similarly sublimate. A is wrong because very moist lower air reduces evaporation and makes surface-reaching precipitation more likely. C is wrong because flooding at the ground does not cause virga. D is wrong because virga requires precipitation particles in the cloud to begin with. Memory cue: virga means “falls but does not arrive”; look for dry air below the cloud.

Related tags

VirgaDry Lower AirEvaporationPrecipitationClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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