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If fog is denser in the lower part of a road, which cause is likely?

Answer and explanation

Correct answer: Cold, moist air has accumulated there.

Answer: C. Low parts of roads, valleys, and hollows can collect cold air because denser cold air tends to move downward and remain in lower places, especially when the atmosphere is stable and wind is weak. If this air also contains sufficient moisture, it may reach saturation as it cools, producing more suspended droplets and denser fog. A is wrong because air above the road is not empty. B is unrelated to the ordinary formation of fog. D is opposite to the requirement: water vapour or moisture is needed for condensation, so no vapour would not promote fog. The observation is a local topographic clue, not proof that every low place always has fog. Memory cue: cold, moist air settles in hollows and can make fog thicker.

Related tags

Low-Lying AreaFogCold AirMoistureForms Of Condensation: DewFrostAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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