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If moisture is sufficient but air does not rise and cool, what is lacking for cloud formation?

Answer and explanation

Correct answer: Cooling needed for condensation

Direct answer: A, cooling needed for condensation. Moisture by itself does not guarantee a cloud. Cloud formation generally requires moist air to cool to its dew point or otherwise reach saturation. When air rises, it expands under lower pressure and cools; if saturation is reached, water vapour condenses on tiny particles and cloud droplets form. In the situation described, moisture is already sufficient, but the lifting and cooling step is missing, so condensation may not begin. A is correct. B is wrong because the question explicitly says that moisture is sufficient. C is wrong because air is present; the problem is its temperature and saturation state. D is wrong because a physical ground surface is not essential for clouds to form at altitude. Memory cue: moisture is the material, but cooling brings it to saturation; both are needed for a cloud.

Related tags

Cloud FormationCoolingMoistureClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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