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13 Cards in this Set
- Front
- Back
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mass wasting |
downslope movement of solid material under the influence of gravity |
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factors controlling slope failure |
1) slope angle - steeper slope, greater instability 2) amount of water - with increasingly wet material water pushes sediment grains apart 3) amount of plant cover - plant roots help bind sediment |
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angle of repose |
angle at which slopes are stable (dry slopes are stable at around 30-35 degrees) |
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triggers |
commonly an earthquake, can be heavy rainstorm, toppling of a tree, etc. |
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creep |
very slow movement of material down a slope - monetarily costly, but not dangerous (common in areas where freezing and thawing occur) |
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flow |
general term for chaotic downslope motion of a mixture of rock, soil and water |
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debris flow |
dominated by coarse material |
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mudflow |
dominated by water and fine material |
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lahar |
generated by volcanic eruption - mudflow |
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slump |
unconsolidated solid material moves downslope along a curved surface |
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rockslide |
very rapid large-scale downslope movement of solid material along an inclined surface |
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rockslide |
classic landslides no water mixed with solid material |
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rockfall |
solid, coherent blocks of rock fall through the air or roll down a cliff two main reasons: 1) fractured cliff breaks off into separate pieces 2) undercutting - erosion beneath solid rock |
