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In which condition is snowfall more likely to reach the ground as snow?

Answer and explanation

Correct answer: Air layers remain cold enough down to the ground

Correct answer: A. Snow forms as ice crystals or snowflakes in a sufficiently cold cloud. To reach the ground as snow, those flakes must pass through the air below the cloud without melting. If the lower layers remain at or below a sufficiently cold temperature, the solid flakes can survive their descent. A warm layer near the ground may melt them into rain, or partly melt them into sleet or another form of precipitation depending on the full temperature profile. B and D are wrong because warm air or a hot surface encourages melting. C is wrong because cloud water vapour or ice is necessary for precipitation to form. The important clue is the vertical temperature profile, not only the temperature inside the cloud. Memory cue: snow stays snow when the whole route downward stays cold.

Related tags

SnowfallTemperature ProfileSolid PrecipitationClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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