Ch. 7 Sec. 3

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Ch. 7 Sec. 3

• Erosion and Deposition

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Erosion

• Transports materials from one place to another
• Streams and rivers
• Glaciers
• Wind
• Ocean Currents
• When the erosion process slows down, materials
  dropped in another location Deposition

3
Gravitys Role

• Gravity pulls erosional agents down slope
• Rivers need to flow
• Landslides and glacial movement follow gravity

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Erosion Running Water

• Greatest when large volumes of water is moving
  rapidly
• Higher to lower elevations
• Smaller streams flow to larger streams
• System is known as a watershed

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Erosion Running Water

• Rill Erosion
• Running water in small channels on a side of a
  slope

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Erosion Running Water

• Gully Erosion
• Channels that becomes deep wide
• Can be more than 3 m deep
• Major problem for farming and grazing areas

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Coastal Deposition and Erosion

• Each year, streams rivers carry billions of
  metric tons of sediments to coastal areas
• River flows into the ocean and water slows
• Build up of the sediments known as Deltas

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Coastal Deposition and Erosion

• Ocean waves and tides erode the coastal areas
• Dunes and beaches form as a result from the
  accumulating particles

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Glacial Erosion

• Large scale and dramatic
• So large they carry huge rock piles and debris
  over great distances
• Many lakes and waterfalls are products of glacial
  movement

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Wind Erosion

• Wind can easily transport fine, dry materials
• Abrasive action of wind-blown particles can be
  damaging
• Death Valley
• Wind barriers can help reduce damage trees