Colluvium is a mixture of weathered rock and debris below soil.

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Colluvium is a geological term that refers to the accumulation of loose rock and soil debris at the base of a slope or hill, resulting from rockfall, landslides or other forms of erosion. It is typically composed of a mixture of weathered rock, gravel, sand, silt, and clay particles, and can vary in thickness and composition depending on the local geology, climate, and topography.

Colluvium Is a Mixture of Weathered Rock and Debris Below