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Fog represents which physical state transition condition within the water cycle?

Answer and explanation

Correct answer: Condensation of water vapor near the ground surface

Answer: A, condensation of water vapour near the ground. Water vapour is an invisible gas. When air close to the ground cools sufficiently, it may reach saturation, meaning it cannot hold all its moisture as vapour. The excess vapour changes into extremely small liquid-water droplets around particles in the air. These suspended droplets form fog, which is essentially a cloud at or very near the Earth’s surface. B describes melting, a solid-to-liquid change, and it does not define fog. C is a pressure change, not the visible formation of fog. D concerns water uptake by roots and is not a phase transition that produces fog. Do not confuse fog with smoke: fog consists mainly of tiny liquid-water droplets, whereas smoke contains particles produced by burning or other processes. Memory cue: vapour plus cooling near the ground equals condensation and fog.

Related tags

FogCondensationWater CyclePhase ChangeHydrological CycleThe Living WorldBiologyClass 11 Mcq

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