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Why does fog gradually clear after sunshine?

Answer and explanation

Correct answer: Solar heat evaporates droplets

Direct answer: A, solar heating can evaporate the fog droplets. Fog is a cloud at or near the ground, made mainly of tiny suspended water droplets, and sometimes ice particles. When sunlight warms the ground and the nearby air, the air can hold more water vapour. Some of the liquid droplets then evaporate back into invisible water vapour. Heating may also encourage mixing of the foggy air with drier air, so visibility improves and the fog gradually clears. B is wrong because sunlight does not turn air into stone. C is wrong because fog does not move underground; its droplets evaporate or disperse. D is wrong because fog clearing does not mean that oxygen disappears. The process may be slower when the air remains cool, very humid, or when weak sunlight provides little heating. Memory cue: warming changes visible droplets back into invisible vapour.

Related tags

GeographyFogSunshineEvaporationForms Of Condensation: DewFrostAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereClass 12 Mcq

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