Types of motion, some include all three, while in many cases, it is not easy to have an understanding how the material moved. That said, the different types of slope failure are summarized below.Failure TypeKind of MaterialKind of MotionRate of MotionRock FallRock splintersVertical or closely-vertical fall (in addition to bouncing in many cases)        Very fast ( more than 10s m/s)Rock SlideA huge rock bodyMotion as a unit alongside a planar surface (translational sliding)Generally quite slow (mm/y to cm/y), few can be fasterRock AvalancheA huge rock body that slides and then collapse into smaller splintersFlow (at high speeds, the mass of rock splinters is suspended on a pillow of air)Very fast (more than 10s m/s)MudflowLoose sediment with a substantial component of clay and siltFlow (a mixture of water and deposits moves down a channel)Moderate to quick (cm/s to m/s)Debris FlowSand, gravel, and larger broken pieces        Flow (same as mudflow, but customarily faster)  Quick (m/s)Slump        Thick, unconsolidated sedimentMotion as a unit alongside a curved surface (rotational sliding)   Slow and steady (cm/y to m/y)Creep or SolidificationSoil or other load in small cases, mixed with iceFlow (although sliding motion may also take place)Super slow (mm/y to cm/y)