Weathering and erosion

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Weathering and erosion

  1. 1. Weathering and Erosion
  2. 2. Weathering <ul><li>The breakdown do the materials of Earth’s crust into smaller pieces. </li></ul>
  3. 3. Physical Weathering <ul><li>Process by which rocks are broken down into smaller pieces by external conditions. </li></ul><ul><li>Types of Physical weathering </li></ul><ul><ul><li>Frost heaving and Frost wedging </li></ul></ul><ul><ul><li>Plant roots </li></ul></ul><ul><ul><li>Friction and impact </li></ul></ul><ul><ul><li>Burrowing of animals </li></ul></ul><ul><ul><li>Temperature changes </li></ul></ul>
  4. 4. Frost Wedging
  5. 5. Frost Heaving
  6. 6. Plant Roots
  7. 7. Friction and Repeated Impact
  8. 8. Burrowing of Animals
  9. 9. Temperature Changes
  10. 10. Chemical Weathering <ul><li>The process that breaks down rock through chemical changes. </li></ul><ul><li>The agents of chemical weathering </li></ul><ul><ul><li>Water </li></ul></ul><ul><ul><li>Oxygen </li></ul></ul><ul><ul><li>Carbon dioxide </li></ul></ul><ul><ul><li>Living organisms </li></ul></ul><ul><ul><li>Acid rain </li></ul></ul>
  11. 11. Water <ul><li>Water weathers rock by dissolving it </li></ul>
  12. 12. Oxygen <ul><li>Iron combines with oxygen in the presence of water in a processes called oxidation </li></ul><ul><li>The product of oxidation is rust </li></ul>
  13. 13. Carbon Dioxide <ul><li>CO 2 dissolves in rain water and creates carbonic acid </li></ul><ul><li>Carbonic acid easily weathers limestone and marble </li></ul>
  14. 14. Living Organisms <ul><li>Lichens that grow on rocks produce weak acids that chemically weather rock </li></ul>
  15. 15. Acid Rain <ul><li>Compounds from burning coal, oil and gas react chemically with water forming acids. </li></ul><ul><li>Acid rain causes very rapid chemical weathering </li></ul>
  16. 16. Karst Topography <ul><li>A type of landscape in rainy regions where there is limestone near the surface, characterized by caves, sinkholes, and disappearing streams. </li></ul><ul><li>Created by chemical weathering of limestone </li></ul>
  17. 17. Features of Karst: Sinkholes
  18. 18. Features of Karst: Caves
  19. 19. Features of Karst: Disappearing Streams
  20. 20. Erosion <ul><li>The process by which water, ice, wind or gravity moves fragments of rock and soil. </li></ul>
  21. 21. Water Erosion <ul><li>Rivers, streams, and runoff </li></ul>
  22. 22. Ice Erosion <ul><li>Glaciers </li></ul>
  23. 23. Wind Erosion
  24. 24. Mass Movements <ul><li>Landslides, mudslides, slump and creep </li></ul>landslide clip.mpeg

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