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If coalescence of droplets in a cloud is rapid why does rainfall chance increase?

Answer and explanation

Correct answer: Droplets can quickly reach fallable size

Direct answer: A. Coalescence means that cloud droplets collide and join to form a larger droplet. Very tiny cloud droplets are light enough to remain suspended because air currents can support them. When several droplets combine, the new drop has greater mass and its downward gravitational pull becomes more important. Once it becomes sufficiently large, it can fall through the cloud as precipitation. Rapid coalescence makes this growth happen sooner and therefore raises the chance that drops will reach the ground as rain, provided they do not evaporate or freeze on the way. A is correct because it states the essential result of collision and joining. B is wrong because coalescence combines droplets rather than making them always disappear. C is wrong because liquid water does not become rock through cloud droplet merging. D is the opposite of the process: effective coalescence supports rain formation. Memory cue: collision plus joining equals growth; growth makes falling easier.

Related tags

CoalescenceDroplet GrowthRain FormationCloud PrecipitationClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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