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Explanation:

III) The biotic factors refer to the living components of an ecosystem, and the abiotic factors refer to the non-living, chemical and physical components of the ecosystem.

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Soil can be classified into three primary types based on its texture – sand, silt, and clay. However, the percentage of these can vary, resulting in more compound types of soil such as loamy sand, sandy clay, silty clay, etc. Also their are- black soil, alluvial soil, laterite soil and loesses.

Alluvial soils are soils deposited by surface water. You'll find them along rivers, in floodplains and deltas (like the Mississippi Delta), stream terraces, and areas called alluvial fans. This last category results from larger floods, causing the soil to spread out in the shape of a triangle fan. They are very fertile.