Erosion, deposition


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Erosion, deposition

  1. 1. Erosion The process by which wind, water, ice or gravity transports (takes) soil and sediment from one location (place) to another.
  2. 2. Wave Erosion This happens when waves crash against the shore. Following are some pictures and descriptions of wave erosion.
  3. 3. Sea Stacks were once connected to the mainland. Waves have ERODED the mainland leaving behind columns of rock, standing all alone.
  4. 4. Sea Arches form when wave action continues to erode a sea cave, cutting completely through the rock.
  5. 5. Sea caves form when waves cut large holes into weak rock along a sea cliff.
  6. 6. Wave Deposition   What is “Wave Deposition” you ask? Well… Waves carry a lot of stuff, including sand, rock pieces, dead coral and shells. A lot of times, this material is “deposited,” or left, on a shoreline, where it forms a beach. Following are some examples of what waves have “deposited” on the shore. (“Wave deposition”)
  7. 7. Beaches are made of different types of material deposited by waves.
  8. 8. Other types of water erosion… A river caused this beautiful valley in Hawaii to form.
  9. 9. The Grand Canyon…ever been there? The Grand Canyon was formed by moving water.
  10. 10. Wind Erosion Have you ever been working outside and had a gusty wind blow a stack of papers all over the place? If this has happened to you, then you have seen how wind erosion works. Wind removes soil, sand, and rock particles and transports them from one place to another.
  11. 11. Wind Erosion the grinding and wearing away of rock when blowing pieces of sand and rock rub against another rock surface.
  12. 12. Wind Deposition  Ok, now that you know what wave deposition is, I bet you can guess what “wind deposition” is right?.....So…..what is it? 
  13. 13. Loess feels like baby powder! Loess forms when wind carries material far away from it’s source.
  14. 14. Sand dunes form when a mound of wind-deposited sand keeps moving and keeping it’s shape at the same time, even though it moves.
  15. 15. Ice or Glacial Erosion    Glaciers smooth the land by scraping and eroding parts of the land that were there before the ice appeared. Glaciers also carve out rugged features in the mountain rock through which they flow. Following are some example pictures.
  16. 16. Alpine Valley Glaciers carved out this rugged landscape in Switzerland.
  17. 17. By the way… Mrs. Ambrosio took this photo of that same valley in Switzerland (from the other direction, obviously) from a cable car.
  18. 18. Cirques are examples of glacial erosion because glaciers cut into the back of the mountain.
  19. 19. Glacial Deposition  So…tell me…what is glacial deposition? 
  20. 20. Glacial Drift happens when rock material is carried and deposited (there’s that word again) by glaciers.
  21. 21.  Not all changes in the earth are due to slow processes like EROSION. Some changes are due to rapid processes, like landslides, volcanic eruptions and earthquakes!  Following are some picture examples.
  22. 22. Landslides happen when rock and soil suddenly move down a slope.
  23. 23. Mudflows happen when mud or rock and soil mixed with a large amount of soil flow down a slope or hill.
  24. 24. Volcanic Eruptions Mt. St. Helens erupted on May 1, 1981. It definitely changed the land in the area. Before…
  25. 25. After… How do you think the eruption of Mt. St. Helens affected the surrounding land?