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If the air is very dry, how likely is fog formation?

Answer and explanation

Correct answer: Low

Correct answer: A, low. Fog forms when air near the ground contains enough water vapour and cools until the vapour condenses into very small suspended droplets. Very dry air contains little water vapour, so it usually does not have enough moisture to produce fog, even if the temperature falls. Therefore the chance of fog formation is low. A is correct because it expresses this reduced likelihood. B is wrong because very dry air is not generally favourable for condensation into fog. C is wrong because fog is never certain merely because air is present or cool; moisture and suitable cooling are also needed. D is wrong because the likelihood is not always the same; it changes with humidity, temperature, cooling, wind, and local conditions. Memory cue: fog needs both cooling and moisture; dry air lacks the moisture part.

Related tags

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

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