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Which statement shows that cloud formation does not depend only on moisture?

Answer and explanation

Correct answer: Along with moisture cooling and condensation nuclei may also be needed

Direct answer: A. Moisture is necessary for cloud formation, but water vapour generally must also cool to its dew point or otherwise reach saturation. Condensation nuclei, such as very small particles in the air, can provide surfaces on which droplets form. Thus moisture alone does not guarantee a cloud or rainfall. A is correct because it names the additional processes or conditions that may be needed. B is wrong because moisture alone does not always produce rain; air must cool and droplets must grow sufficiently, among other conditions. C is wrong because moisture is essential rather than a barrier to clouds. D is wrong because clouds form from moist air, not only dry air. Also, cloud formation and rainfall are not identical: clouds may exist without producing rain reaching the ground. Memory cue: cloud formation needs moisture plus cooling and suitable condensation conditions; moisture is necessary but not always sufficient.

Related tags

GeographyCloud FormationCondensation NucleiMoistureClouds And PrecipitationWater In The AtmosphereClass 12 Mcq

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