Sheet, rill, and slide are terms used to describe forms of

• A. Sedimentation
• B. Runoff
• C. Soil compaction
• D. Erosion

Answer: (D)

These terms describe how soil is removed from the surface, which is erosion. Sheet erosion is the uniform thinning and removal of a soil layer by overland water flow. Rill erosion happens when that flow becomes concentrated into small channels, cutting into the soil and forming rills. Slide refers to mass movement downslope, where soil or rock detaches and moves as a unit under gravity. All of these involve detachment and transport of soil, not deposition (sedimentation), not soil compaction, and not just the presence of runoff. So they’re best understood as distinct forms of erosion.