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Why can light fog form over an open field on a cold morning?

Answer and explanation

Correct answer: Moist air cooling and changing into tiny droplets

Direct answer: A. Fog is formed when moist air near the ground cools enough to become saturated. At saturation, some water vapour condenses into extremely small liquid droplets that remain suspended in the air. Over an open field, nighttime or early-morning cooling can produce this condition, especially when moisture is present. A is correct because it includes both necessary ideas: moisture and cooling. B is wrong because soil does not need to become lava for fog to form. C is wrong because fog requires water vapour or moisture; removing all vapour would prevent condensation. D is wrong because fog does not require the Sun’s temperature to become zero. Memory cue: fog needs “moisture + cooling + near-ground air,” not the disappearance of moisture.

Related tags

FogCold MorningMoist AirCondensationForms Of Condensation: DewFrostAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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