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If air has enough moisture but no uplift, what obstacle remains for cloud formation?

Answer and explanation

Correct answer: The cooling needed for condensation may not occur

Correct answer: B. Moisture alone does not guarantee cloud formation. For clouds to form, air usually needs to cool until it reaches saturation, allowing water vapour to condense onto suitable nuclei. Uplifting air expands because pressure decreases with height, and this expansion generally causes adiabatic cooling. If there is no uplift or another effective cooling mechanism, moist air may remain unsaturated and condensation may not begin. Option A is wrong because the question already states that enough moisture is present. Option C is physically impossible and unrelated to cloud formation. Option D is wrong because rain normally requires cloud particles to form and grow; it does not occur merely because air is moist. B identifies the missing step: cooling toward saturation. Memory cue: “moisture plus cooling, often supplied by uplift, supports clouds.”

Related tags

Cloud FormationUpliftCoolingCondensationClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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