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Which of the following can reduce visibility the most?

Answer and explanation

Correct answer: Fog

Correct answer: A, fog. Fog contains a large concentration of tiny water droplets suspended in the air near the ground. These droplets scatter and partly block light, making distant objects difficult to see and reducing the distance at which a person can identify an object. Dense fog can therefore reduce visibility much more than dew or frost. B is incorrect because dew consists mainly of liquid droplets deposited on surfaces such as grass and leaves; it does not normally fill the air with enough droplets to greatly obstruct vision. C is incorrect because frost is a coating of ice crystals on cold surfaces, not a cloud of suspended particles in the viewing path. D is incorrect because a clear sky usually allows good visibility, although other conditions could still affect it. The key distinction is suspended droplets in the air versus water deposited on a surface. Memory cue: fog floats in the air and blocks the view; dew and frost stay on surfaces.

Related tags

FogLow VisibilitySuspended DropletsWeatherForms Of Condensation: DewFrostAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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