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Which component of the water cycle helps maintain the salinity balance in oceans?

Answer and explanation

Correct answer: Freshwater input from rivers

Direct answer: A, freshwater input from rivers. Rivers carry water from land into the oceans. This freshwater flow helps balance the concentration of dissolved salts, while evaporation removes mostly water and leaves salts behind, tending to increase salinity locally. The complete salinity pattern is also influenced by precipitation, ice processes, ocean mixing, and circulation, but among these choices river input is the relevant water-cycle component. B is wrong because ordinary ocean boiling is not a normal water-cycle process and would remove water rather than balance salinity. C does not control the ocean’s overall salt balance. D can move and mix surface water but is not the stated freshwater input. Memory cue: rivers add fresh water; evaporation removes water and concentrates salt.

Related tags

SalinityRiversEvaporationOcean Water CycleHydrological CycleThe Living WorldBiologyClass 11 Mcq

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