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Sediments brought by rivers help in the formation of what?

Answer and explanation

Correct answer: Alluvial plains

The direct answer is C, Alluvial plains. Rivers erode material upstream, carry it as sediment, and deposit it when their speed decreases, especially on gentle land or during floods. Repeated deposition spreads layers of fine soil over a broad, fairly flat area. Such a plain is called an alluvial plain, and its soil is often fertile because it contains river-borne minerals and fine particles. Option A, Clouds, are formed mainly by water vapour cooling and condensing; river sediment does not form them. Option B, Stars, are enormous hot bodies formed by processes in space, not by river deposits. Option C is correct because alluvial plains are created by the accumulation of alluvium brought by rivers. Option D, volcanic lava, is molten rock produced by volcanic activity; it is completely different from river sediment. The reasoning is therefore: river carries sediment, the flow slows, sediment settles, and a broad plain develops. Exam cue: ‘river deposits over a wide flat area’ points to an alluvial plain.

Related tags

Alluvial PlainsSedimentsDeposition

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