8 1 mass movement

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8 1 mass movement

  1. 1. Mass movement Any kind of erosion by gravity Makes mountains smaller
  2. 2. <ul><li>Erosion – wears way surface materials and moves them someplace else </li></ul>
  3. 3. Agents of erosion <ul><li>Gravity </li></ul><ul><li>Glaciers </li></ul><ul><li>Water </li></ul><ul><li>Wind </li></ul>
  4. 4. Deposition <ul><li>Dropping of sediment when agent of erosion loses energy </li></ul>
  5. 5. Gravity erosions Water weakens a layer of soil. Or a strong layers lays on top a weaker layer Mass of material slips down a curved surface Fast Slump Weathering that causes it Physical description Speed Name of erosion
  6. 6. Slump
  7. 10. Ice wedging - Soils very slowly move down hill Slow Creep
  8. 13. Ice wedging heavy rain Blocks of rock work loose of slope and come crashing down often in spring Fast Rock fall Sketch Weathering Description Speed Name
  9. 18. After heavy rains or earthquake Whole layer of rock slips down hill Fast Rock slide Sketch Weathering Description Speed Name
  10. 19. Fan shaped deposit. Removal of grass ( drought or fire) then heavy rain. Thick layer of loose sediment moves downhill Fast Mudflow Reason /weathering Description Speed Name
  11. 20. Mass movement <ul><li>All are on steep slope </li></ul><ul><li>Gravity causes all </li></ul><ul><li>Often occur after heavy rain ( or earthquake) </li></ul>
  12. 21. Building on slopes. <ul><li>Pros? ( good things) </li></ul><ul><li>Cons? (bad stuff) </li></ul>
  13. 22. Ways to slow mass movement <ul><li>Plant veggies (plants- grass trees) will help hold soil in place. </li></ul><ul><li>Drainage pipes – to remove water </li></ul><ul><li>Concrete or stone walls – retaining walls </li></ul><ul><li>You may slow mass movements but you can never STOP it </li></ul>

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