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Why are both dew and frost considered surface forms?

Answer and explanation

Correct answer: Because they deposit on surfaces rather than remaining suspended in air

Correct answer: A. Dew and frost are called surface forms because condensation or deposition takes place directly on a cool object or ground surface. First, air near the surface cools to its dew-point temperature. If the temperature remains above freezing, water vapour changes into liquid droplets; these droplets are dew. If the surface is below freezing, vapour changes directly into ice crystals, producing frost. Therefore, both are attached to grass, soil, leaves, roofs, or other exposed surfaces rather than floating freely in the air. A is correct because it describes this location-based distinction. B is wrong: dew and frost do not form only above clouds. C is wrong: both originate from atmospheric water vapour. D is wrong: ocean currents are movements of seawater, not forms of condensation. Memory cue: dew is liquid on a surface; frost is ice on a surface. Fog and mist, in contrast, consist of suspended droplets near the ground.

Related tags

DewFrostSurface CondensationForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeographyClass 12 Mcq

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