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Why is rising air considered important for cloud formation?

Answer and explanation

Correct answer: Because rising air expands and cools

Correct answer: A. Air pressure generally decreases with height. Therefore, when a parcel of air rises, it expands because the surrounding pressure is lower. Expansion causes the air to cool without requiring direct heat loss; this is called adiabatic cooling. If the rising air contains enough water vapour, cooling may bring it to saturation, or nearly saturation. Water vapour then condenses on tiny particles called condensation nuclei, producing cloud droplets or ice crystals. A correctly describes the beginning of this sequence: uplift, expansion, cooling, saturation, and condensation. B is wrong because rising air is not always dry; it may contain abundant moisture. C is wrong because rising does not destroy water vapour; cooling can convert it into liquid droplets or ice. D is unrelated and physically impossible in this context. Memory cue: “rising air cools, cooling encourages condensation.”

Related tags

Cloud FormationRising AirAdiabatic CoolingCondensationClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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