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Why can fog persist longer in a valley during temperature inversion?

Answer and explanation

Correct answer: Cold moist air is trapped below and mixing is reduced

Correct answer: C. Normally, air temperature decreases with height, so air can mix vertically. During a temperature inversion, a warmer layer lies above colder air near the ground. The warm layer acts like a lid and strongly reduces vertical mixing. In a valley, the denser cold air settles at the bottom and may retain moisture and suspended droplets. Because this moist air is not easily replaced by drier air, the fog can remain for a longer time, especially when winds are weak. A is wrong because the upper layer does not remove all droplets. B is the opposite of the real condition: moisture is present. D would encourage evaporation and weakening of fog, not persistence. Memory cue: inversion is a lid; cold, moist valley air stays trapped below it.

Related tags

Valley FogTemperature InversionAir MixingHumidityForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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