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3-1 Mass Movement When slopes fail…

3-1 Mass Movement When slopes fail…. REVIEW Once weathering has occurred, then erosion can take place. What is EROSION?. EROSION is the process of carrying away weathered rock. The Grand Canyon is an example of what erosion can do!.

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3-1 Mass Movement When slopes fail…

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  1. 3-1 Mass Movement When slopes fail…

  2. REVIEW Once weathering has occurred, then erosion can take place. What is EROSION?

  3. EROSION is the process of carrying away weathered rock. The Grand Canyon is an example of what erosion can do!

  4. Eventually most of the broken bits of rock end up in streams & rivers that flow down from the mountains. These little bits of rock & sand are called SEDIMENTS.

  5. What is DEPOSITION? DEPOSITION is the process of laying down weathered rocks in a new location.

  6. Weathering, sediments, erosion and deposition work together in a cycle! Weathering Sediments Deposition Erosion

  7. What is Mass Movement? Erosion & deposition of large amounts of sediment downhill, sediment is usually loose

  8. How does Mass Movement work? By the force of gravity Can be fast or slow

  9. Landslide La Conchita, CA 1995

  10. Landslide Close-up La Conchita, CA 1995

  11. Landslide Looking down La Conchita, CA 2005

  12. Landslide

  13. Landslide

  14. Before Landslide Peru's Main Plaza Landslide's Destruction After

  15. Video of a Real Landslide in Japan

  16. Video of a Rockslide in Tennessee

  17. 1. LANDSLIDE (very fast) Happens when rock and soil break loose from steep slopes • most destructive mass movement • falls quickly to the bottom • occur in mountainous areas • may contain huge masses of rock

  18. Mudslide/Mudflow

  19. Mudslide/Mudflow

  20. Video of a Real Mudslide in California

  21. Video of a Real Mudslide in Italy

  22. 2. MUDSLIDE/MUDFLOW (very fast) A thick mixture of sediments and water flow down a slope • occur in dry areas where weathering forms thick layers of dry sediment • heavy rains mix with sediment to make mud • have enough energy to move anything in its path • at the bottom of slope, loses its energy of motion deposits all the sediments and debris it has been carrying

  23. Bismarck, North Dakota 1987 Slump

  24. Bismarck, North Dakota 19889 months later Slump

  25. Slump

  26. Video of Real Slump over 8 days

  27. 3. SLUMP (fast) Occurs when loose material or rock layers slip downward as one large mass • takes place as one large mass • doesn't move materials very fast or very far • curved scar is left where slumped material was • occur because the clay under the slumped material weakens because it gets very wet • when it can no longer support overlying material it slips downhill

  28. Creep

  29. Creep http://www.physicalgeography.net/fundamentals/10x.html

  30. 4. CREEP (very slow) Gets its name from the way sediments slowly creep down a hill • especially common in areas where freezing and thawing occur (ice wedging) • as the ground freezes, small sediments are pushed up by expanding water in the soil • when the soil thaws, the sediments fall downhill • trees, utility poles and fence posts lean or slant downhill

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