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What thermal condition inside a cloud is needed for snowfall?

Answer and explanation

Correct answer: Cold enough for ice crystals to remain solid

Correct answer: A, the cloud must be cold enough for ice crystals or snowflakes to form and remain solid. In a sufficiently cold cloud, water vapour can deposit directly onto ice crystals, and the crystals can join to form snowflakes. For snowfall to reach the ground as snow, the air below the cloud also generally needs to remain cold enough to prevent melting. A is correct because solid precipitation requires freezing conditions and available moisture. B is wrong because if all ice melts, the precipitation becomes rain rather than snow. C is wrong because extreme heat destroys ice and is not an atmospheric snow condition. D is wrong because snowfall requires water or moisture, not complete dryness. Memory cue: snowfall is solid precipitation, so think “ice preserved from cloud to ground.”

Related tags

SnowfallCold CloudsIce CrystalsSolid PrecipitationClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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