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Coe tail presentation 2

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Soil Erosion

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Coe tail presentation 2

  1. 1. Let’s look at Wind ErosionErosion whereit startsErosion –The movement of topsoil and soil Iitter) from one place toanother by water and wind (Natural and human causes)
  2. 2. •Uncovered soil •Plowed soil •Wind“It takes hundreds of years to replenish 2.5 cm oftopsoil.” Miller GT
  3. 3. Water Erosion – loss of soil – from farm fields Great plans of the US has lost 1/3 of its topsoil in150 years since the start of farming.
  4. 4. Sheet and Rill Erosion “The plains of the US has lost 1/3 of its topsoil in 150 years since first plowed.” Miller, GT
  5. 5. Rivers carry sediment, eroded soil, especially whenstorms occur…
  6. 6. Here’s erosion at the end……An estuary from space….. Notice…. What are the implications of this?
  7. 7. GullyErosion“15 – 20 centimeters of topsoil is all that stands betweenmuch of the world and mass starvation.” Miller, GT
  8. 8. Gully erosion
  9. 9. Erosion in Ethiopia“15 – 20 centimeters of topsoil is all that stands betweenmuch of the world and mass starvation.” Miller, GT
  10. 10. Erosion, can be slow, inexorable or aQuick Slumping of land
  11. 11. Slumping of land
  12. 12. Slumping of land
  13. 13. Slumping of land…….can be massive
  14. 14. Slumping of land….from the air.
  15. 15. Slumping of land…..all over the place, from theair.Notice the effect of deforestation.
  16. 16. Erosion of soil from the air
  17. 17. Erosion of soil from the air Montana farm field
  18. 18. With its rivers running blood red and staining thesurrounding Indian Ocean, astronauts have remarked that itlooks as if Madagascar is bleeding to death.

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