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What is the direct cause of reduced visibility in fog?

Answer and explanation

Correct answer: Scattering of light by tiny water droplets

Direct answer: D. Fog contains countless tiny water droplets suspended near the ground. When light travels through this droplet-filled air, the droplets scatter and partly redirect the light. This reduces contrast and makes distant objects appear blurred or hidden, so visibility falls. A higher oxygen concentration does not directly produce the visual obstruction. B, heating of the ground, would generally help evaporate or disperse fog rather than directly cause the reduced visibility described here. C, breaking rocks, has no necessary connection with fog. The droplets are the immediate optical cause, while cooling and saturation are formation conditions. Keep the two ideas separate: cooling helps form fog; droplet scattering reduces visibility. Memory cue: fog blocks clear sight because tiny droplets scatter light.

Related tags

FogVisibilityLight ScatteringWater DropletsForms Of Condensation: DewFrostAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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