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If air is saturated but the ground is warm what condition may be lacking for fog formation?

Answer and explanation

Correct answer: Surface cooling that keeps lower air cold

Answer: A. Saturated air already contains as much water vapour as it can hold at that temperature, but saturation alone does not guarantee fog. Fog generally requires the air near the ground to cool to its dew point, allowing some vapour to condense into suspended droplets. If the ground remains warm, the lower air may not receive the necessary cooling, so fog formation can be prevented or delayed. A identifies this missing condition. B is wrong because saturated air necessarily contains water vapour. C is not a special missing condition; fog forms in air. D is absurd because the existence of the Sun is not the direct requirement being tested. Memory cue: fog needs both moisture and cooling; saturation supplies moisture, not necessarily cooling.

Related tags

FogSaturationSurface CoolingDew PointForms Of Condensation: DewFrostAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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