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What problem can occur due to excessive silt deposition in a river?

Answer and explanation

Correct answer: River depth may decrease and flood risk may increase

Silt is fine material such as soil, clay, and very small mineral particles carried by flowing water. When too much silt settles in a river channel, the channel may become shallower and its capacity to carry water can decrease. During heavy rain or high flow, water may then overflow the banks more easily, increasing flood risk in nearby areas. The exact effect depends on the river, flow, and management conditions, so the result is a possible consequence rather than an unavoidable one.

Option A is correct because it states that river depth may decrease and flood danger may increase. A river does not always become deeper from silt deposition; pollution does not end because of silt, and a river’s source does not become a sea. The supplied explanation correctly connects siltation with reduced carrying capacity and possible flooding. Therefore the supplied answer A is accurate.

Related tags

GeographyDrainageRivers

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