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Which layer of the atmosphere appears most directly affected when fog forms?

Answer and explanation

Correct answer: Lower layer near the ground

Correct answer: A, the lower layer near the ground. Fog is a collection of very small water droplets suspended in air close to the Earth's surface. It forms when moist air cools to its dew point, so the water vapour condenses into droplets. Because these droplets remain near the ground and reduce horizontal visibility, fog is mainly a lower-atmosphere phenomenon. Option A is correct because it identifies the air layer where fog is observed. Option B is wrong because fog is not a phenomenon of the very high atmosphere or outer space. Option C is wrong because fog may occur over land as well as near water; it is not confined to a layer below the sea. Option D is wrong because the Earth's centre is not part of the atmosphere. Memory cue: fog is like a cloud at ground level; always connect it with near-surface air and reduced visibility.

Related tags

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

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