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What is the main reason clouds form before rain?

Answer and explanation

Correct answer: Water vapour cooling and condensing

Direct answer: A, water vapour cools and condenses into tiny droplets or ice crystals. Water first enters the atmosphere as vapour through evaporation and other processes. When moist air rises, it often expands and cools. If it cools to the point where condensation can occur, vapour changes into visible droplets around condensation nuclei. These droplets collect to form clouds. With continued growth, they may become heavy enough to fall as rain or another form of precipitation. B is wrong because the Sun does not need to switch off for condensation. C is wrong because Earth’s rotation does not stop before ordinary cloud formation. D is wrong because air is necessary to hold and transport the droplets; it does not disappear. Memory sequence: evaporation, cooling, condensation, cloud, precipitation.

Related tags

Cloud-FormationWater-VapourCondensationRainfallClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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