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If lower air is moist but the surface is warm, what condition will be lacking for fog formation?

Answer and explanation

Correct answer: Lack of surface cooling

Answer: A. Fog is a near-surface cloud made of tiny droplets. For it to form, the lower air must contain enough moisture and must cool to, or sufficiently close to, its dew point. A cool surface can remove heat from the air touching it and encourage condensation. If the surface is warm, this cooling process is missing or weak, even though moisture is present. A is therefore correct. B is not correct because the question already says that the lower air is moist; water vapour is available. C is not a missing condition because air is present by definition. D is also not the key issue: ground may be present, but a warm surface does not cool the adjacent moist air enough. Memory cue: fog needs moisture plus cooling, not moisture alone.

Related tags

FogSurface CoolingMoistureDew PointForms Of Condensation: DewFrostAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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