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If ice crystals form aloft and completely melt while descending, what will reach the ground?

Answer and explanation

Correct answer: Rain

Correct answer: A. Ice crystals can form in the cold upper part of a cloud and begin falling toward the surface. If they pass through a layer of air whose temperature is above freezing and that warm layer is deep enough, the crystals melt completely. After melting, the particles are liquid water droplets, so they reach the ground as rain, provided they do not evaporate before arrival. Option A is correct because complete melting changes solid ice into liquid precipitation. Option B is wrong because frost forms when water vapour deposits or freezes on a cold surface, not when falling crystals completely melt. Option C is wrong because fog is a cloud at or near the ground, not the direct result described here. Option D is wrong because mist is also near-surface suspended moisture. Memory cue: ice plus a complete warm-layer melt equals rain; an incomplete melt can produce a different form.

Related tags

Melting LayerRainIce CrystalsPrecipitation TypeClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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