__________ is a type of mass movement where regolith detaches and slides downslope along a spoon-shaped plane and comes to rest more or less as a unit.

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A slump is a type of mass movement where regolith (loose soil, rock, and sediment) detaches and slides downslope along a spoon-shaped plane and comes to rest more or less as a unit. The movement occurs along a concave-upward curved surface, and the movement is recognized by the backward rotation of the material on the surface of failure. Soil creep is a very slow downhill movement of soil and sediment, solifluction is a type of soil movement in cold environments where the active layer of soil freezes and thaws, causing the upper layer of soil to flow downhill, and a landslide is a more rapid, downslope movement of rock, soil or debris.

__________ Is a Type of Mass Movement Where Regolith Detaches