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Which process increases when the velocity of a river suddenly decreases?

Answer and explanation

Correct answer: Deposition

Direct answer: Option B, deposition. A river carries sediment only while its velocity and energy are sufficient. If velocity suddenly decreases, the river cannot carry as much sand, silt, gravel, or clay. The heavier or larger particles settle first, followed by finer material. This settling and accumulation is called deposition. B is correct. A, erosion, needs enough energy to cut and remove material; it generally weakens when the river slows. C, evaporation, is liquid water changing into vapour and is not the main result of a sudden fall in river speed. D, condensation, is vapour changing into liquid and belongs to the water cycle. Memory cue: fast water carries; slow water deposits.

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DrainageRiversVelocity

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