When descending cohesive material moves "en masse" along a curved surface of rupture that just formed, it is termed a_____ .

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A slump occurs when a mass of soil or rock moves as a single unit along a curved surface of rupture. This type of movement is characteristic of cohesive materials, which tend to stick together, allowing them to move in a block-like fashion rather than flowing or spreading out.

When Descending Cohesive Material Moves "En Masse" Along a Curved