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What must be present in air for cloud formation?

Answer and explanation

Correct answer: Water vapour

Correct answer: B — water vapour. Clouds form when water vapour in moist air cools and condenses into tiny liquid droplets or ice crystals. Without water vapour, there is no water material available to form a cloud. Cooling and suitable atmospheric conditions are also needed, and microscopic particles can provide surfaces for condensation, but the essential moisture source is water vapour. A is incorrect because smoke may provide particles but cannot replace water vapour. C is incorrect because lava is molten rock and is unrelated to ordinary cloud formation. D is incorrect because sea sand is not the required atmospheric water source. Do not confuse invisible water vapour with visible steam or smoke; water vapour itself is a gas and cannot normally be seen. Memory cue: “cloud = water vapour cooled and condensed.”

Related tags

Cloud FormationWater VapourHumidityCondensationEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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