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When a river suddenly loses velocity, which material is generally deposited first?

Answer and explanation

Correct answer: Large pebbles and coarse sand

The correct answer is C. A river’s ability to carry material depends strongly on its velocity. Large, dense particles require stronger moving water, so when velocity suddenly falls, large pebbles and coarse sand lose support and settle first. Smaller particles such as silt and clay can remain suspended in slower water and may travel farther before deposition. Dissolved salts are carried within the water as a solution and do not behave like ordinary solid bed load. Vapour is not the normal solid sediment transported and deposited by a river. A common confusion is to think that the finest particles settle first because they are small; in reality, small particles are often carried farther because they settle slowly. Memory cue: largest load first, finest load last.

Related tags

River LoadDepositionSediment SizeVelocityMass MovementsErosionAnd DepositionMass Movements Erosion And DepositionGeomorphic ProcessesGeography

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