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When very tiny water droplets remain suspended near the ground and reduce visibility, which process is central?

Answer and explanation

Correct answer: Condensation

Direct answer: A, condensation. Fog and mist form when water vapour in air changes into extremely small liquid droplets that remain suspended close to the ground. First, moist air must cool sufficiently, usually to its dew point or near it. As cooling occurs, the air cannot hold all of its water vapour, so some vapour changes into droplets. These droplets scatter light and make distant objects difficult to see. A is correct because condensation is the change from invisible vapour to visible liquid droplets. B, weathering, is the breakdown of rocks at or near Earth’s surface and does not create fog. C, earthquake motion, is movement caused by seismic energy and has no role in ordinary fog formation. D, salt crystallisation concerns dissolved salts forming crystals, not atmospheric water droplets. Memory cue: suspended droplets plus reduced visibility means fog or mist, and fog or mist begins with condensation. Do not confuse condensation, the formation process, with fog, the visible result.

Related tags

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

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