Soil that forms on unconsolidated deposits is called colluvial soil.

Here's why:

* Colluvium: This term refers to the loose, unconsolidated material that accumulates at the base of slopes due to gravity. It can be a mixture of rocks, soil, and other debris.

* Colluvial soil: When soil develops directly on this colluvium, it is termed colluvial soil. These soils often have a poorly developed profile and can be quite variable in texture and composition depending on the source material and the slope.

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