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In which condition is fog formation most likely?

Answer and explanation

Correct answer: Air temperature is near the dew point and the lower layer is moist

Correct answer: A. Fog is a cloud at or near the ground. It forms when air in the lowest layer cools to, or close to, its dew point, so the air becomes saturated and water vapour condenses into numerous tiny suspended droplets. Moisture near the surface supplies the water needed for this process. A is correct because it combines near-dew-point cooling with sufficient moisture. B is wrong because very warm, dry air is far from condensation conditions. C is wrong because condensation cannot form fog without water vapour. D is wrong because a very warm and unsaturated surface layer does not favour condensation. Fog can reduce visibility, but the essential idea is near-surface saturation. Memory cue: fog is a cloud touching the ground.

Related tags

FogDew PointLower AtmosphereForms Of Condensation: DewFrostAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeographyClass 12 Mcq

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