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What must happen to droplets in a cloud for rain to occur?

Answer and explanation

Correct answer: They become large and heavy

Correct answer: A, the droplets must grow large and heavy enough to fall. A cloud contains very small water droplets and, in colder parts, ice particles suspended by rising air and turbulence. Through collision and coalescence, droplets can join one another; some may also grow through processes involving ice crystals. As the drops become larger, gravity acts more strongly on them. When their downward motion is greater than the ability of the air to keep them suspended, they fall as precipitation. B is incorrect because droplets disappearing would mean evaporation, not rain reaching the ground. C is incorrect because water droplets do not turn into dust to form rain. D has no role in the process; rain falls because of gravity and cloud microphysical growth, not because droplets move toward the Sun. Memory cue: tiny suspended droplets must grow before gravity can win.

Related tags

Rain-FormationDroplet-GrowthPrecipitationCloudsClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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