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If the surface is below freezing and the air has enough moisture, which form is more likely?

Answer and explanation

Correct answer: Frost

Correct answer: B, frost. When a moist surface is below the freezing point, water vapour can change directly into solid ice crystals on that surface. This direct change from vapour to ice is called deposition. If the surface were cool but still above freezing, liquid droplets would be more likely and would be called dew. A is therefore wrong for the stated below-freezing condition. C is wrong because mist consists of suspended droplets and the word warm does not describe the required freezing-surface process. D is not a form of atmospheric condensation. Memory cue: moisture plus a freezing surface gives frost; moisture plus a cool non-freezing surface gives dew.

Related tags

FrostDewFreezing SurfaceMoistureForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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