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Along with water vapour, what is needed for cloud formation?

Answer and explanation

Correct answer: Condensation nuclei

Correct answer: A. Clouds form when moist air cools sufficiently and water vapour condenses into very small droplets or ice crystals. In the atmosphere, these droplets usually form around tiny airborne particles called condensation nuclei. Dust, sea-salt particles, smoke, and other fine particles can provide surfaces on which water vapour begins to condense. Water vapour alone is therefore not the complete practical requirement for ordinary cloud formation; cooling and suitable nuclei are also important. B may contribute salt particles in some situations, but sea waves themselves are not the required nuclei. C is too broad and is not the atmospheric term for the particles involved. D is liquid water below the ground and does not act as airborne nuclei. Memory cue: nuclei are the tiny “seeds” on which cloud droplets grow.

Related tags

GeographyCondensation NucleiCloud FormationWater VapourClouds And PrecipitationWater In The AtmosphereClass 12 Mcq

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