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What is one major reason for cloud formation in mountain regions?

Answer and explanation

Correct answer: Moist air rising and cooling

Direct answer: C. When moist air reaches a mountain slope, the relief forces it to rise. As the air rises, surrounding pressure decreases and the air expands and cools. If it cools to its dew point, water vapour condenses on tiny particles in the air and forms cloud droplets or ice particles. This is called orographic lifting and is a common reason for clouds in mountainous areas. A is incorrect because the sea does not need to freeze for mountain clouds to form. B describes descending and warming air; warming generally lowers relative humidity and discourages condensation, so it is not the main process here. D is incorrect because completely dry ground would provide less moisture, not a direct cloud-forming mechanism. Memory cue: mountains lift moist air; rising air cools; cooling causes condensation and clouds.

Related tags

GeographyMountain CloudsOrographic LiftClouds And PrecipitationWater In The AtmosphereClass 12 Mcq

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