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Clouds are mainly formed by what?

Answer and explanation

Correct answer: Condensation of water vapour

Answer: B, condensation of water vapour. Clouds form when moist air rises or is otherwise cooled. Cooling reduces the amount of water vapour that the air can hold. When the air reaches saturation, water vapour condenses on very small particles suspended in the atmosphere, forming tiny water droplets. At sufficiently low temperatures, some cloud particles may be ice crystals. A is incorrect because dust does not melt to form ordinary clouds; dust may sometimes provide a surface on which condensation occurs. C is incorrect because freezing sea salt is not the process that creates cloud water or ice particles. D is incorrect because clouds do not form simply because air stops moving; cooling and condensation are essential processes. Clouds can later produce precipitation when droplets or ice particles grow large enough to fall. Memory cue: clouds are collections of condensed water droplets or ice crystals, not smoke or melted dust.

Related tags

GeographyCloudsCondensationPrecipitationClouds And PrecipitationWater In The AtmosphereClass 12 Mcq

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