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Which movement of air is important in advection fog?

Answer and explanation

Correct answer: Moving horizontally over a cold surface

Correct answer: D. The word advection refers to the horizontal movement of air. Advection fog forms when moist air moves horizontally over a colder land or water surface. Contact with the cold surface cools the lower part of the air to its dew point; the air becomes saturated, and water vapour condenses into suspended droplets. D correctly states both the important movement and the cold-surface condition. A is wrong because underground movement is not the atmospheric process involved. B is wrong because completely still air is associated more closely with local cooling processes, not the defining movement of advection fog. C is physically unrelated to fog formation. Memory cue: advection means air is carried across a surface—usually horizontally.

Related tags

Advection FogHorizontal Air MovementCold SurfaceDew PointForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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