Erosion

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Erosion
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Erosion and Deposition

• Changes the Land

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Erosion

• Is the process by which natural forces move
  weathering rock and soil from one place to
  another.

• Types of Erosion
• Landslides
• Gravity
• Running water
• Glaciers
• Waves
• wind

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Landslide

• What Causes a Landslide?
• Most destructive mass movement
• Rock and soil slide quickly down a steep slope

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Mudslides

• a mudslide is one type of landslide. Steep hills
  and mountains are often the site of land and
  mudslides. Slopes on these hills and mountains
  become weakened by many things
• - erosion by rivers, glaciers or ocean waves
• - fires leave slopes bare and vulnerable to rain
• - heavy rain or snowmelt saturates the ground
• - earthquakes weaken the structure of the slope -
  volcanic eruptions produce loose ashfall deposits
  and debris slopes
• - traffic, blasting operations, machinery and
  even thunder can vibrate weak slopes

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Gravity

• What is gravity
• Gravity is the force that moves rock and other
  materials downhill.
• Gravity cause mass movement
• Movement can be slow or rapid
• Types of movement landslides, mudslides slump and
  creep

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Slump

• When a mass rock and soil suddenly slip down a
  slope.
• Unlike a landslide, the material in slump moves
  down in one large mass.
• Slump often occurs when water soaks the base of a
  mass of soil that is rich in clay.

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Creep
Creep is the very slow downhill movement or rock
and soil. It occurs on gentle slope. Creep is so
slow that you barely notice it. Creep may tilt
objects at spooky angles