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colluvium
This term is used primarily in geology and geomorphology to describe materials that move downslope under the influence of gravity. It is distinct from alluvium, which refers to materials transported and deposited by water. The term implies a slow, often imperceptible movement of debris, such as soil, gravel, and boulders, accumulating at the base of a slope.
As a mass noun referring to a geological deposit, it is treated as uncountable. In technical writing, it is rarely pluralized; instead, researchers refer to "layers of colluvium" or "colluvial deposits" to describe specific quantities or distinct strata.