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Clouds floating in the atmosphere are possible mainly because of which physical condition in the water cycle?

Answer and explanation

Correct answer: Very small water droplets and rising air

Correct answer: B. Clouds are made mainly of extremely small liquid water droplets and, in colder regions, ice crystals suspended in air. Each tiny droplet has very little mass, so air resistance and rising or turbulent air currents can keep it suspended for some time. Warm air rises, cools, and may cause water vapour to condense around tiny particles, producing these droplets or crystals. A is wrong because water is still affected by gravity and larger drops fall. C is wrong because gravity has not disappeared; when droplets combine and become large enough, precipitation occurs. D alone is incomplete: wind may move clouds, but cloud formation and suspension also involve condensation, droplet size, and air currents. Memory cue: tiny droplets plus moving air can remain suspended; large drops fall as rain.

Related tags

CloudsWater DropletsAir CurrentsCondensationHydrological CycleThe Living WorldBiologyClass 11 Mcq

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