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Why can visibility improve after sunrise when fog has formed?

Answer and explanation

Correct answer: Heating can evaporate droplets and lower relative humidity

Answer: A. After sunrise, solar energy can warm the ground and the air near it. Warmer air can hold more water vapour, so the existing tiny fog droplets may evaporate. If the amount of moisture does not rise as quickly as the air’s capacity to hold it, relative humidity decreases and the air moves away from saturation. The fog then becomes thinner and visibility improves. Option A is correct, although clearing can also depend on wind and local conditions. Option B is wrong because water vapour does not turn into stone. Option C is wrong because sunlight does not remove the atmosphere. Option D is wrong because fog droplets do not automatically become rainfall; they may evaporate or remain suspended. Memory cue: warming often reduces relative humidity and helps fog evaporate.

Related tags

FogSunriseEvaporationRelative HumidityForms Of Condensation: DewFrostAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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