General Terms:
* Mass wasting: This is a broad term encompassing all types of downslope movement of rock, soil, and regolith under the influence of gravity.
* Slope failure: This refers to the instability of a slope leading to downslope movement.
Specific Terms Based on Movement Type:
* Creep: Slow, gradual movement of soil and rock, often imperceptible without careful observation.
* Slump: A rotational slide where a mass of rock or soil moves along a curved surface.
* Slide: A rapid downslope movement of rock or soil along a planar surface.
* Flow: A fluid-like movement of soil and rock, often involving saturated material. Examples include mudflows, debris flows, and earthflows.
* Fall: A free-fall of rock from a cliff or steep slope.
* Rockfall: A specific type of fall involving the detachment and free fall of rock fragments.
* Debris flow: A rapid flow of water-saturated soil, rocks, and debris.
* Mudflow: A debris flow with a high water content.
* Earthflow: A slow, viscous flow of soil, typically involving saturated clay.
Other factors to consider:
* Material: The type of material involved can affect the terminology. For example, "rockfall" is used for rock, while "debris flow" includes a mixture of rock, soil, and organic matter.
* Speed: The speed of movement is also important. Slow movements are often called "creep," while rapid movements are called "flows" or "slides."
* Trigger: The cause of the downslope movement can also be considered. Triggers include earthquakes, heavy rainfall, and human activities like construction.
Therefore, the specific term used to describe rock and soil moving down a slope depends on the details of the event.
