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Which stage of the water cycle helps clean atmospheric impurities such as dust and some gases?

Answer and explanation

Correct answer: Precipitation

Correct answer: B, precipitation. As raindrops or snow fall through the atmosphere, they can capture suspended dust, aerosols, and some soluble gases. These materials are brought down to the ground in a process often called atmospheric washout or wet deposition. This can temporarily reduce the concentration of some impurities in the air, although it does not remove every pollutant and may make the rainwater or soil more contaminated. A, evaporation, changes liquid water into vapour and generally leaves most non-volatile particles and salts behind. C, runoff, is water flowing over land after it reaches the surface; it can carry pollutants across the ground but does not primarily clean the atmosphere. D, percolation, is downward movement through soil. Memory cue: falling precipitation washes particles out of the air.

Related tags

PrecipitationAir PurificationWater CycleHydrological CycleThe Living WorldBiologyClass 11 Mcq

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