Chapter 7 Section 3 Notes

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Chapter 7 Section 3 Notes

  1. 1. Chapter 7 Section 3 Soil Erosion
  2. 2. <ul><li>Soil EROSION or loss is important because plants do not grow as well when topsoil is lost </li></ul><ul><li>Causes and effects of soil erosion – many humans activities disturb the natural BALANCE between soil production and soil erosion. </li></ul>
  3. 3. <ul><ul><li>AGRICULTURAL CULTIVATION – increased farming removes the plant cover, leaving soils open to wind and water erosion. </li></ul></ul><ul><ul><li>FOREST HARVESTING – removes forest which increases erosion and particularly damages tropical rain forest soil. </li></ul></ul>
  4. 6. <ul><ul><li>OVERGRAZING results when animals graze until almost all ground cover disappears. </li></ul></ul><ul><ul><li>EXCESS SEDIMENT can damage the environment when soil erosion is severe </li></ul></ul>
  5. 9. <ul><li>Preventing soil erosion – soil must be PROTECTED </li></ul>
  6. 10. <ul><ul><li>Manage crops </li></ul></ul><ul><ul><ul><li>Farmers plant SHELTER BEDS of trees to break the force of the wind. </li></ul></ul></ul><ul><ul><ul><li>Bare soil can be COVERED with decaying plants to hold soil in place </li></ul></ul></ul>
  7. 12. <ul><ul><ul><li>Farmers can GRAZE ANIMALS on vegetation instead of plowing it under. </li></ul></ul></ul><ul><ul><ul><li>With NO-TILL farming, plant stalks are left in the field to provide cover for soil. </li></ul></ul></ul>
  8. 14. <ul><ul><li>Reduce erosion on slopes </li></ul></ul><ul><ul><ul><li>CONTOUR farming reduces soil erosion by planting along the contours of slopes </li></ul></ul></ul><ul><ul><ul><li>TERRACING creates steep-sided flat areas for crops on the sides of hills and mountains. </li></ul></ul></ul>
  9. 19. <ul><ul><li>Reduce erosion of exposed soil </li></ul></ul><ul><ul><ul><li>WATER is sprayed onto bare soil to reduce wind erosion </li></ul></ul></ul><ul><ul><ul><li>Topsoil is replaced and TREES are planted </li></ul></ul></ul>
  10. 21. <ul><ul><ul><li>WATER flow can be controlled in strip mines </li></ul></ul></ul><ul><ul><ul><li>After mining, the land can be RECLAIMED </li></ul></ul></ul>

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