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Ch. 7 Sec. 3

Ch. 7 Sec. 3 . Erosion and Deposition. 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. Gravity’s Role.

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Ch. 7 Sec. 3

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  1. Ch. 7 Sec. 3 Erosion and Deposition

  2. 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. Gravity’s Role • Gravity pulls erosional agents down slope • Rivers need to flow • Landslides and glacial movement follow gravity

  4. 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

  5. Erosion: Running Water • Rill Erosion • Running water in small channels on a side of a slope

  6. Erosion: Running Water • Gully Erosion • Channels that becomes deep & wide • Can be more than 3 m deep • Major problem for farming and grazing areas

  7. 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

  8. Coastal Deposition and Erosion • Ocean waves and tides erode the coastal areas • Dunes and beaches form as a result from the accumulating particles

  9. 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

  10. 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

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