1. Plural of colluvium; loose rock debris and soil that accumulates at the base of slopes or hillsides, typically moved downslope by gravity and weathering rather than by water erosion.
Usage: geology; technical term; plural form

Examples

• The geologist examined the colluvia at the foot of the mountain to understand past erosion patterns.
• Colluvia deposits often contain a mixture of clay, silt, sand, and rock fragments.
• The hillside's colluvia revealed evidence of repeated freeze-thaw weathering cycles.
• Archaeologists found artifacts buried within the colluvia layers of the ancient settlement.
• Heavy rainfall can mobilize colluvia downslope, creating hazardous debris flows.