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Under which condition is fog formation more likely?

Answer and explanation

Correct answer: Moist air near the surface cooling to the dew point

Direct answer: D. Fog is a cloud made of tiny water droplets close to the ground. It forms when moist air near the surface cools to its dew point and becomes saturated; water vapour then condenses into droplets around suitable nuclei. A is wrong because a hot, dry afternoon usually encourages evaporation rather than near-surface condensation. B is wrong because bright sunshine and low moisture make saturation less likely. C is wrong because high temperature and very little vapour provide neither sufficient cooling nor moisture. D combines moisture, near-surface location, and cooling to the dew point, so it is the best answer. Memory cue: fog is “a cloud at ground level,” so look for moist air plus cooling.

Related tags

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

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