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If very cold but very dry air blows over a field what will be the biggest limitation for frost formation?

Answer and explanation

Correct answer: Availability of water vapour

Correct answer: D. Frost formation needs more than low temperature. There must also be enough moisture near the surface for water vapour to deposit as ice crystals or freeze on the surface. Very cold, dry air supplies the temperature condition but lacks sufficient water vapour, so the amount of frost may remain small or frost may not form. A is wrong because a field provides a surface. B can favour radiational cooling, but night alone cannot supply missing moisture. C is already present in the question, so it is not the limitation. D identifies the missing ingredient. Memory cue: frost requires cold plus moisture; cold and dry is not automatically frosty.

Related tags

FrostDry AirMoisture AvailabilityIce DepositionForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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