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What can be the main reason for fog clearing after sunrise?

Answer and explanation

Correct answer: Evaporation of droplets as the surface and lower air warm

Answer: A. Fog consists of very small liquid water droplets suspended near the ground. During the night, the ground and the air close to it may cool enough for water vapour to condense. After sunrise, solar radiation warms the surface and the lower layer of air. Warmer air can hold more water vapour, so the droplets may evaporate back into the air; gentle mixing may also help disperse them. Option A is correct because it gives the main heating-and-evaporation process. Option B is impossible because air does not become rock. Option C is wrong because warming usually favours evaporation, not automatic frost formation. Option D is the opposite of reality: sunlight supplies heat after sunrise. Memory cue: night cooling helps fog form; morning heating often helps fog disappear.

Related tags

Fog ClearingSunriseEvaporationForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeographyClass 12 Mcq

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