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If dense fog seems to sit low on a road, what atmospheric condition can it indicate?

Answer and explanation

Correct answer: Cold, moist and stable lower air

Correct answer: B. Fog is made of tiny water droplets suspended in air near the ground. When the lower air is cold and moist, it can reach saturation easily. If that lower layer is stable, there is little vertical mixing, so the droplets remain concentrated close to the road and the fog appears to sit low. A is wrong because warm upper air alone does not explain the required moisture and near-ground droplets. C is the opposite of the truth: fog needs water vapour and condensation. D is unrelated to atmospheric condensation and is physically irrelevant. Memory cue: low, persistent fog usually suggests a moist, cooled and stable near-surface layer.

Related tags

FogStable AirLower AtmosphereHumidityForms Of Condensation: DewFrostAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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