When weathering occurs on hillslopes, rock debris usually pile up at the bottom of the hill slope to form

Analyze the question: The question asks what forms when weathered rock debris collects at the foot (bottom) of a hillslope.

Concept: Weathering breaks rock down in place. On steep slopes, especially in areas with frost action or strong temperature changes, the loosened fragments fall or roll downslope under gravity. They collect at the base as a sloping heap of angular rock fragments called scree (also called talus).

Check each option:

• A. Creep: This is the very slow downhill movement of soil and regolith. It is a process, not a landform of piled-up debris at the base.
• B. Pebbles: These are small, rounded stones shaped by water abrasion in rivers or beaches. They are not specifically formed by debris piling at a hill's foot.
• C. Levee: This is a raised bank along a river, formed by deposition during floods. It has nothing to do with hillslope weathering.
• D. Screes: These are accumulations of angular rock fragments at the bottom of a slope or cliff. This matches the question exactly.

Answer: The correct option is **D.

Tip: Think of "scree" as "scree-ching down" the slope. Scree is angular and sits at the foot of a slope, while pebbles are rounded and are linked to water. Whenever you see "debris at the bottom of a slope," think scree or talus.