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Why does visibility decrease in fog?

Answer and explanation

Correct answer: Tiny water droplets float in air

Correct answer: A. Fog is a near-ground cloud made of very small water droplets suspended in the air. These droplets scatter and partly absorb light travelling between an observer and an object. Because less direct light reaches the eyes, distant objects look blurred or may not be seen clearly, so visibility decreases. Option A is correct because the suspended droplets are the immediate physical cause. Option B is wrong: the Sun does not literally disappear, even though fog may block or weaken sunlight. Option C is wrong because foggy air contains droplets; it is not empty. Option D is wrong because ground temperature alone is not the direct reason visibility is reduced. Memory cue: fog means condensed droplets near the ground; misty droplets scatter light.

Related tags

GeographyFogCondensationVisibilityWater DropletsForms Of Condensation: DewFrostAnd MistForms Of Condensation Dew Frost Fog And MistWater In The Atmosphere

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