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Which fog can form when cold air flows over a warm water surface?

Answer and explanation

Correct answer: Evaporation fog

Correct answer: C, evaporation fog. Begin with the two air–water conditions: the water surface is warm and the air moving over it is cold. Warm water adds moisture to the lower layer of air through evaporation. Cold air cannot hold as much water vapour as warm air, so it may quickly become saturated. The excess vapour then condenses into tiny suspended droplets, producing evaporation fog. A is wrong because dust is a particle, not the named fog type formed by cold air over warm water. B is wrong because mountain fog is associated with elevated terrain and does not describe this specific process. D is not a standard geographical type of fog. Thus C wins because it identifies moisture supplied by evaporation followed by condensation. Memory cue: warm water + cold air = evaporation fog.

Related tags

Evaporation FogWarm WaterCold AirCondensationForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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