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What is necessary for small cloud droplets to change into rainfall?

Answer and explanation

Correct answer: They become larger and heavier

Correct answer: C. Newly formed cloud droplets are extremely small and light, so they can remain suspended in the cloud. To become raindrops, they must grow through processes such as collision and coalescence, in which moving droplets collide and join, or through interactions between ice particles and supercooled droplets in suitable clouds. As the droplets grow, their mass and downward gravitational force increase. Eventually, they become large and heavy enough to fall through the air as rain. C is correct because growth and increased weight are necessary for rainfall. A is wrong because smaller droplets are even easier for air currents to keep suspended. B is wrong because changing into gas would mean evaporation, not rainfall. D is wrong because dust is not the product needed to form a raindrop. Memory cue: “cloud droplets float; raindrops fall after growth.”

Related tags

Rain FormationDroplet GrowthCoalescencePrecipitationClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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