Chapter 3 Erosion

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Chapter 3Erosion Deposition

• Effects of Gravity on Erosion
• 3.4
• Mrs. Teamans Erosion Example

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QUESTIONS TO THINK ABOUT

• Explain the difference between erosion and
  deposition.
• What forces cause erosion?

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Wearing Down Building Up

• Erosion The process by which natural forces move
  weathered rock and soil form one place to
  another.
• - Sediment
• - Deposition
• Weathering, erosion, and deposition act
  together in a cycle that wears down and builds up
  the Earths surface.

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Mass Movement

• Gravity The force that moves rock and other
  materials downhill.
• - Landslides
• - Mudslides
• - Slump
• - Creep

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LANDSLIDES

• The most destructive kind of mass movement.
• Occurs when rock and soil slide quickly down a
  steep slope.

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MUDFLOWS

• The rapid downhill movement of a mixture of
  water, rock, and soil.
• Often occur after heavy rains in a normally dry
  area.

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SLUMP

• A mass of rock and soil suddenly slips down a
  slope.
• The material moves down in one large mass.
• Often occurs when
• water soaks the base
• of a mass of soil rich
• in clay.

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CREEP

• Very slow downhill movement of rock and soil.
• Often causes objects like trees to lean.
• Often results from the
• freezing and thawing of
• water in cracked layers
• of rock beneath the soil.

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Questions 4 You!!!

• Explain the difference between erosion and
  deposition.
• What forces causes erosion?

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Answers 4 You!

• Explain the difference between erosion and
  deposition.
• - Erosion moves sediment from one place to
  another, while deposition lays down sediment in
  new locations.
• What force causes erosion?
• - The force of gravity and the forces exerted by
  running water, waves, and wind.

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THE END!