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If droplet growth is rapid and lower air is not very dry, why does the chance of surface rainfall increase?

Answer and explanation

Correct answer: Drops can become large enough to fall and reach the surface with less evaporation

Direct answer: A is correct. Cloud droplets are initially so small that air currents can keep them suspended. Through collision, coalescence, or other growth processes, some droplets become large enough for gravity to overcome the supporting effects of the air, so they begin to fall. The condition of the lower air then matters. If it is not very dry, a falling drop loses less water through evaporation and has a better chance of reaching the ground as rain. Thus rapid growth prepares a drop for falling, while relatively moist lower air helps preserve it during the descent. B is wrong because drops remain water, not rock. C is wrong because lower air does not always stop precipitation; its temperature and humidity can either modify or support it. D is wrong because rapid growth increases the size of some drops rather than destroying the water. Memory cue: grow large in the cloud, survive the fall below the cloud.

Related tags

Droplet GrowthSurface RainfallLower AirClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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