A type of mass movement that occurs when a mass of material moves down a curved slope.

A type of mass movement that occurs when a mass of material moves down a curved slope.

• A. Slump
• B. Landslide
• C. Creep
• D. Mass Wasting

Answer: (A)

When a mass of material moves as a coherent block along a curved slip surface, rotating as it slides, you’re looking at a slump. The key feature is the curved, often spoon‑shaped surface along which the material slides and the rotational movement of the displaced mass, which gives the upper part of the block a backward tilt as the toe moves outward. This curved-surface, rotational slide distinguishes slump from other forms: landslides can be rapid movements along various surfaces but aren’t defined by a curved slip surface, creep is extremely slow and not the result of a curved downslope rotation, and mass wasting is the broad umbrella term that includes slump among other processes.

When a mass of material moves as a coherent block along a curved slip surface, rotating as it slides, you’re looking at a slump. The key feature is the curved, often spoon‑shaped surface along which the material slides and the rotational movement of the displaced mass, which gives the upper part of the block a backward tilt as the toe moves outward. This curved-surface, rotational slide distinguishes slump from other forms: landslides can be rapid movements along various surfaces but aren’t defined by a curved slip surface, creep is extremely slow and not the result of a curved downslope rotation, and mass wasting is the broad umbrella term that includes slump among other processes.