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Why is the lower air layer important in fog formation?

Answer and explanation

Correct answer: Because fog forms from tiny suspended droplets in air near the ground

Correct answer: A. Fog is essentially a cloud whose base is at or very close to the ground. The lower layer of air can become cool enough for its water vapour to reach saturation. Once saturation is reached, some vapour condenses into very small liquid droplets. These droplets remain suspended in the air and scatter light, reducing visibility; this is what we observe as fog. B is wrong because the stratosphere is far above the surface and fog is a near-ground phenomenon. C is the opposite of reality: lower air can contain plenty of water vapour. D is wrong because air is a mixture of gases, not rock. Memory cue: fog is a cloud at ground level.

Related tags

FogLower AtmosphereSaturationVisibilityForms Of Condensation: DewFrostAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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