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Why may rainfall not occur even after cloud formation?

Answer and explanation

Correct answer: Cloud droplets may not grow large enough to fall.

Correct answer: A. Cloud formation means that air has cooled enough for water vapour to condense into tiny droplets or ice particles, often around condensation nuclei. These particles are usually extremely small and may remain suspended because upward air movement and turbulence can balance their weight. For rainfall, cloud particles must grow sufficiently large and heavy. Growth can occur when droplets collide and join, or when ice crystals grow and later melt as they fall. If this growth is weak, the cloud may remain present without producing measurable rain at the ground. B is wrong because clouds contain tiny liquid droplets, ice crystals, or both. C is wrong because saturation is an important condition for cloud formation, although it alone does not guarantee rainfall. D is wrong because clouds are water or ice particles, not smoke. Memory cue: a cloud is the beginning of the process; precipitation requires particle growth.

Related tags

Cloud FormationCloud DropletsPrecipitationCondensationClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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