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If alluvial soil is repeatedly changed and renewed in an area, what will be the effect on the soil profile?

Answer and explanation

Correct answer: New silt can keep the surface layer fertile

Answer: A. Alluvial soil is made from sediments carried and deposited by rivers. During repeated flooding, a new layer of fine silt and other mineral particles may be spread over the floodplain. This renewal can replenish nutrients and help maintain the fertility of the surface layer, although actual fertility also depends on drainage, farming practices, and the particular sediments deposited. A is correct because it describes the likely effect of repeated fresh alluvium. B is wrong because soil does not immediately turn into granite; granite is a solid igneous rock formed through geological processes. C is wrong because soil renewal does not mean that every water source disappears. D is wrong because alluvial deposition does not create permanent ice. Memory cue: fresh flood silt renews the topsoil; Khadar is the commonly used term for newer alluvium.

Related tags

Alluvial SoilSoil ProfileSilt RenewalKhadarThe Northern PlainsPhysical Features Of IndiaGeographyClass 9 Mcq

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