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Which stage of the water cycle is a natural method of purifying water?

Answer and explanation

Correct answer: Evaporation

Correct answer: B, evaporation. When water receives heat, it changes from liquid into water vapour. Dissolved salts and many non-volatile materials do not evaporate with the water, so they remain in the original water body while the vapour is separated from them. This makes evaporation an important natural purification step, although it does not remove every possible pollutant and the resulting water is not automatically safe to drink. A, surface runoff, is water flowing over land and may collect soil, waste, and pollutants. C, condensation, changes vapour back into liquid droplets; it follows evaporation but is not the main separation step. D, percolation is downward movement through soil and can filter some particles, but it may also carry dissolved contaminants. Memory cue: evaporation separates water from many dissolved substances.

Related tags

Water CycleEvaporationNatural PurificationPercolationHydrological CycleThe Living WorldBiologyClass 11 Mcq

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