Erosion and Mass Movements

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Erosion and Mass Movements
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Erosion

• Erosion causes the wearing away and lowering of
  Earths land and surface features as it
  transports material away
• The sun fuels the water cycle and the forces of
  erosion

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Mass Movements

• ?Mass Movement The transfer of rock and soil
  downslope due to gravity
• Factors that trigger mass movements
• Water-saturated Surface
• Over-steepening of Slopes
• Lack of Vegetation
• Earthquakes
• .

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Mass Movements
? Mass movements are classified on the kind of
material that moves, how it moves, and the speed
of movement.
? Rockfalls/Debris Fall When rocks or rock
fragments fall freely through the air.
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Mass Movements

• Debris Flow In a debris flow, a block of
  material moves suddenly along a flat, inclined
  surface

Speed 1 mm/ day to 1 km/hr
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Heavy Rains Can Trigger Slumps
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Mass Movements

• Flows include
• Avalanches
• Mudflows
• Landslides

Mudflows
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Mass Movements

• Creep the slow, downhill movement of soil
• Soil Creep moves more material per year than any
  other mass movement- even though it is slow, it
  is constantly happening
• Creep can cause Cracked roads, leaning utility
  poles, and bent trees

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