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Cloud formation begins with which change?

Answer and explanation

Correct answer: Water vapour cooling and changing into droplets

Correct answer: A, water vapour cools and changes into droplets. Water at Earth’s surface evaporates and enters the atmosphere as invisible water vapour. When moist air rises or is otherwise cooled, it may reach saturation. The vapour then condenses on tiny particles in the air, such as dust or salt particles, and forms very small water droplets or ice crystals. A large collection of these suspended particles is seen as a cloud. Option A is correct because cooling followed by condensation is the essential beginning of cloud formation. Option B is wrong because soil may provide dust particles, but soil flying is not the basic change that forms a cloud. Option C is impossible and unrelated to the water cycle. Option D is wrong because clouds form within air; air does not disappear. Memory cue: evaporation adds vapour, cooling causes condensation, and condensation forms clouds.

Related tags

Cloud-FormationCondensationWater-VapourWater-CycleClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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