Erosion And Deposition Cynthia

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Erosion And Deposition Cynthia

  1. 1. Actions That Change Earth’s Surface
  2. 2. <ul><li>The physical or chemical processes that break down (wear away) rocks </li></ul><ul><li>Agents of weathering: wind, water, ice, gravity, plants and animals (biologic) </li></ul><ul><li>Mechanical weathering: ice wedging, root pry, abrasion (grinding), exfoliation, animals, and thermal expansion </li></ul><ul><li>Chemical weathering: oxidation (iron + oxygen + water = rust), acidic precipitation (from burning fossil fuels: sulfur, carbon dioxide, and nitrogen), plant acids (lichens and mosses) carbonic acids (marble and limestone), hydrolysis (feldsapar to clay), and dissolution (water) </li></ul>
  3. 3. <ul><li>The type of rock: mineral composition </li></ul><ul><li>Surface area: smaller rocks have a greater surface area (consider volume) and weather faster </li></ul><ul><li>Climate (temperature and precipitation): hot/warm and wet/humid weather fastest </li></ul>
  4. 4. <ul><li>Erosion is the transport (movement) of weathered rocks and sediment from one place to another. </li></ul><ul><li>Erosion is usually gradual… </li></ul><ul><li>Humans can speed it up. </li></ul>
  5. 5. <ul><li>Wind </li></ul><ul><li>Water </li></ul><ul><li>Waves </li></ul><ul><li>Glaciers (ice) </li></ul><ul><li>Gravity (mass movement, mass wasting) </li></ul>
  6. 6. <ul><li>What goes up must come down. </li></ul><ul><li>What is carried must be… dropped. </li></ul><ul><li>Deposition occurs when agents of erosion deposit (lay down, drop) sediment. </li></ul>
  7. 7. <ul><li>Sand bars </li></ul><ul><li>Longshore drift </li></ul>
  8. 8. <ul><li>Large mass of moving ice and snow </li></ul><ul><li>Plucking </li></ul><ul><li>Abrasion </li></ul>
  9. 9. <ul><li>Rapid Mass Wasting… </li></ul><ul><li>Landslide </li></ul><ul><li>Mudflow </li></ul>
  10. 10. <ul><li>Creep </li></ul><ul><li>Slump </li></ul>Slow mass wasting…
  11. 11. <ul><li>Deflation </li></ul><ul><li>Sand dunes </li></ul>
  12. 12. <ul><li>Poor soil conservation… </li></ul>
  13. 13. <ul><li>Running water </li></ul><ul><li>Load deposits </li></ul>
  14. 14. <ul><li> Delta Alluvial fan </li></ul>
  15. 15. <ul><li>Stalactites and stalagmites </li></ul>

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