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Which statement correctly describes the structure of fog?

Answer and explanation

Correct answer: It is a group of tiny water droplets in air

Correct answer: C. Fog is a cloud that forms at or very close to the ground. When moist air near the surface cools to its dew point, some water vapour changes into extremely small liquid water droplets. These droplets remain suspended in the lower air, and millions or billions of them scatter light, making the air look whitish and reducing visibility. Fog is therefore not a single solid object and is not simply water vapour, because water vapour itself is invisible. A is wrong: fog is not only a hot gas; it contains suspended liquid droplets. B is wrong: dust may sometimes provide surfaces on which condensation begins, but dust alone is not fog. D is unrelated to atmospheric condensation. C is correct because it identifies the main visible component and its location in the air. Memory cue: fog is a cloud at ground level; cloud plus ground-level location gives fog.

Related tags

FogWater DropletsVisibilityCondensationForms Of Condensation: DewFrostAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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