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How can cold air moving over a water body create evaporation and fog conditions?

Answer and explanation

Correct answer: Warm water can enhance evaporation and cause condensation in cold air

Answer: A. Evaporation occurs when some water molecules escape from the surface into the air. If the water body is warmer than the air moving over it, the temperature contrast supplies a continuing moisture source, so evaporation can increase. The added vapour enters cold air, which has a relatively low saturation capacity. If that air becomes saturated, the vapour condenses on tiny particles and forms suspended droplets called fog. A is correct because it includes both stages: moisture enters the air and then condenses after saturation. B is wrong because cold air does not turn water into stone; freezing would require suitable temperatures and conditions. C is wrong because warm water can evaporate. D is wrong because fog can form over water, land, valleys, and other areas when moisture and cooling permit it. Memory cue: warm surface supplies vapour; cold air makes it visible as fog.

Related tags

Evaporation FogWater BodyCold AirHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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