lesson 5 Mass movements

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8 Terms

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Causes

  • Steep slope

  • Water (weight/lubrication)

  • Texture of material

  • Initial impetus (triggering event)

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Types of movement

  • Slow (soil creep)

  • Fast (avalanches)

  • Dry (rock creep/talus creep)

  • Fluid (mudflows)

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Slumps

a chunk of the earth moves down but stays mostly in tact

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slides

Excess fluid but consisting of solid material

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Critical Angle

the angle where slopes become unstable (35)

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Scree/talus

pile of rocks formed at base fo cliff

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Causes

  • Gravity

  • Slope angle

  • Pore pressure (water pressure)

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Slope failure

  • reduction in resistance

  • increase in stress