5.3 Mass Movements
Mass movement• The downslope movement of  rock, regolith, and soil under the direct  influence of gravity
rockfall• Occurs when rocks or rock fragments fall  freely through the air; common on steep  slopes
rockslide• Occurs when a mass of rock slides rapidly  downslope along planes of weakness
slump• The downward slipping of a mass of rock or  unconsolidated material moving as
mudflow• Quickly moving downhill flow of soil and rock  fragments containing a large amount of water
earthflow• Slow- moving downslope movement of water-  saturated, clay-rich sediment, most  characteristics of humid regions
Creep• The slow downhill movement of soil and  regolith
Key Concept• The transfer of rock and soil downslope due to  gravity is called mass movements.
Key Concept• Among the factors that commonly trigger  mass movements are saturation of surface  materials with water, over...
Key Concept• Geologists classify mass movements based on  the kind of material that moves, how it  moves, and the speed of...
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Earth science 5.3

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Earth science 5.3

  1. 1. 5.3 Mass Movements
  2. 2. Mass movement• The downslope movement of rock, regolith, and soil under the direct influence of gravity
  3. 3. rockfall• Occurs when rocks or rock fragments fall freely through the air; common on steep slopes
  4. 4. rockslide• Occurs when a mass of rock slides rapidly downslope along planes of weakness
  5. 5. slump• The downward slipping of a mass of rock or unconsolidated material moving as
  6. 6. mudflow• Quickly moving downhill flow of soil and rock fragments containing a large amount of water
  7. 7. earthflow• Slow- moving downslope movement of water- saturated, clay-rich sediment, most characteristics of humid regions
  8. 8. Creep• The slow downhill movement of soil and regolith
  9. 9. Key Concept• The transfer of rock and soil downslope due to gravity is called mass movements.
  10. 10. Key Concept• Among the factors that commonly trigger mass movements are saturation of surface materials with water, oversteepening of slopes, removal of vegetation, and earthquakes.
  11. 11. Key Concept• Geologists classify mass movements based on the kind of material that moves, how it moves, and the speed of movement.
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