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Why can frost remain longer on shaded grass than on sunny open spots in a winter morning?

Answer and explanation

Correct answer: Ice crystals melt later because shaded areas receive less heat

The correct answer is A. Frost remains visible while the ice crystals stay below their melting point. On a sunny open surface, solar radiation supplies heat to the grass and the frost, so the crystals warm and melt sooner; some moisture may also return to the air. Shaded grass receives much less direct solar energy, so it warms more slowly and the frost can remain for a longer time. B is too absolute: shade may preserve frost, but it does not mean new frost is always forming. C is wrong because sunlight normally melts frost rather than turning it into stone. D is wrong because shade does not remove all water vapour. Memory cue: shade delays warming, and delayed warming delays melting.

Related tags

FrostShadeMeltingMicroclimateForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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