(See related pages)
Below you will find key words and concepts that you should remember from this chapter.
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| creep | Very slow, continuous downslope movement of soil or debris. (See page(s) 326) |
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| debris | Any unconsolidated material at Earth’s surface. (See page(s) 320) |
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| debris avalanche | Very rapid and turbulent mass wasting of debris, air, and water. (See page(s) 331) |
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| debris fall | A free-falling mass of debris. (See page(s) 334) |
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| debris flow | Mass wasting in which motion is taking place throughout the moving mass (flow). The common varieties are earthflow, mudflow, and debris avalanche. (See page(s) 327) |
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| debris slide | Rapid movement of debris as a coherent mass. (See page(s) 334) |
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| earthflow | Slow-to-rapid mass wasting in which debris moves downslope as a very viscous fluid. (See page(s) 327) |
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| fall | The situation in mass wasting that occurs when material free-falls or bounces down a cliff. (See page(s) 320) |
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| flow | A type of movement that implies that a descending mass is moving downslope as a viscous fluid. (See page(s) 320) |
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| landslide | The general term for a slowly to very rapidly descending mass of rock or debris. (See page(s) 320) |
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| mass wasting (or mass movement) | Movement, caused by gravity, in which bedrock, rock debris, or soil moves downslope in bulk. (See page(s) 320) |
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| mudflow | A flowing mixture of debris and water, usually moving down a channel. (See page(s) 329) |
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| permafrost | Ground that remains permanently frozen for many years. (See page(s) 329) |
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| relief | The vertical distance between points on Earth’s surface. (See page(s) 323) |
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| rock avalanche | A very rapidly moving, turbulent mass of broken-up bedrock. (See page(s) 334) |
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| rockfall | Rock falling freely or bouncing down a cliff. (See page(s) 331) |
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| rockslide | Rapid sliding of a mass of bedrock along an inclined surface of weakness. (See page(s) 324) |
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| rotational slide (slump) | In mass wasting, movement along a curved surface in which the upper part moves vertically downward while the lower part moves outward. Also called a slump. (See page(s) 322) |
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| shear force | In mass wasting, the component of gravitational force that is parallel to an inclined surface. (See page(s) 324) |
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| shear strength | In mass wasting, the resistance to movement or deformation of material. (See page(s) 324) |
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| slide | In mass wasting, movement of a relatively coherent descending mass along one or more well-defined surfaces. (See page(s) 320) |
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| solifluction | Flow of water-saturated debris over impermeable material. (See page(s) 328) |
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| talus | An accumulation of broken rock at the base of a cliff. (See page(s) 331) |
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| translational slide | a mass movement where material moves along a plane parallel to the slope of the surface. (See page(s) 322) |