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Why is fog mostly seen near the ground?

Answer and explanation

Correct answer: Because moist air near the surface can cool and become saturated

Correct answer: A. The air close to the ground is strongly affected by the temperature of the surface. At night or during other cooling situations, the ground loses heat, and the moist air touching it also cools. When this air reaches its dew point, it becomes saturated; excess water vapour condenses into tiny droplets suspended near the surface, producing fog. A correctly describes both the moisture and cooling needed for formation. B is wrong because fog can form above sea level as well as near coasts, valleys, plains, and other areas. C is wrong because air is present at higher elevations. D is wrong because the ground does not destroy water vapour; cooling may instead help it condense. Memory cue: cool ground + moist near-surface air = fog.

Related tags

FogGround-Level CoolingSaturationNear-Surface AirForms Of Condensation: DewFrostAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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