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Which statement gives the required physical condition for fog formation most accurately?

Answer and explanation

Correct answer: Lower air becomes saturated and filled with tiny droplets

Answer: D, the lower air becomes saturated and contains tiny suspended droplets. Fog is a cloud at or very near the ground. It develops when air close to the surface cools to its dew point, or when moist air gains enough moisture to reach saturation. Water vapour then condenses into very small liquid droplets, and these droplets remain suspended in the lower atmosphere, reducing visibility. Option A is wrong because hot, dry air contains little moisture and is generally unfavourable for fog. Option B is wrong because moistureless air cannot provide the water needed for droplets; strong wind may also mix or disperse fog. Option C is wrong because snow cover is not essential; fog can form over many surfaces when temperature and moisture conditions are suitable. The important words are lower air, saturation, and tiny droplets. Memory cue: fog is ground-level cloud, so think saturated air near the ground.

Related tags

GeographyFogSaturationVisibilityForms Of Condensation: DewFrostAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereClass 12 Mcq

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