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Why are cloud droplet formation and rainfall considered different processes?

Answer and explanation

Correct answer: Because droplets must also grow to raindrop size

Correct answer: A. First, water vapour cools and condenses on tiny particles, forming very small cloud droplets or ice particles. This creates a visible cloud, but these particles are usually too small and light to fall to the ground. For rainfall, cloud droplets must collide, combine, or otherwise grow sufficiently large and heavy for gravity to overcome air resistance and carry them downward as precipitation. Therefore, cloud formation and rainfall are related but not identical stages. A is correct because growth to raindrop size is additionally required. B is wrong because clouds contain liquid droplets or ice particles. C is wrong because rainfall is water falling as drops or ice particles. D is wrong because condensation means vapour becoming liquid or solid, whereas rainfall means precipitation reaching the ground. Memory cue: cloud formation makes drops; precipitation makes them fall.

Related tags

Cloud DropletsPrecipitationCondensationClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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