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What can be the main reason for light fog over a lake in the morning?

Answer and explanation

Correct answer: Moisture from the water surface and night-time cooling

Correct answer: B. A lake supplies moisture to the air through evaporation. During the night, the air and nearby surface may cool, reducing the air’s capacity to hold water vapour. If the air temperature reaches its dew point, excess vapour condenses into tiny droplets suspended near the lake, producing light fog in the morning. A is wrong because strong daytime heating usually raises temperature and discourages condensation, even though it can increase evaporation later. C is wrong because soil salinity is not the main process controlling this lake fog. D is wrong because fog does not require a permanent complete absence of wind; calm or light winds are generally helpful, but the essential ideas are moisture and cooling. Memory cue: nearby water supplies vapour, night cooling supplies condensation.

Related tags

GeographyLake FogDew PointCondensationForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereClass 12 Mcq

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