Erosion

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Pearson 6th Earth Science terms and defintions

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Erosion

  1. 1. Ch. 7-Erosion
  2. 2. <ul><li>How could something so ‘natural’ be so bad? Soil erosion is natural after all. However, when we change the landscape from forest to yards, streets, farm fields, shopping centers and roads, we accelerate soil erosion. </li></ul><ul><li>In the USA, soil is eroding at about seventeen times the rate at which it forms. </li></ul>
  3. 3. Erosion Process which ______ weathered material from one place to another 1. moves
  4. 4. 2. _________- material moved by erosion sediment
  5. 5. 3. - the process of eroded sediments Deposition dropping
  6. 6. Mass movements weathered fragments are moved from higher to lower elevations by gravity 4.
  7. 7. landslides- varying sized quickly down a steep cliff or slope A. rocks and soil fall
  8. 8. Landslides -combination of any of the mass movements <ul><li>1983 Thistle Utah </li></ul>
  9. 9. <ul><li>1996 landslide Puget Sound </li></ul>
  10. 10. <ul><li>La Conchita California 1995 </li></ul>
  11. 12. mudflow -thick mixture of sedim ents an d water flowing down a slope B.
  12. 13. <ul><li>A mudflow is the rapid movement of a mixture of rock/soil with a significant component of water or air. </li></ul>
  13. 14. soil and rock slip down slope in slump one large mass C .
  14. 16. <ul><li>A slump is a type of slope failure which involves the rotational movement of soil or rock </li></ul>
  15. 18. creep- slow downhill movement of weathered material D.
  16. 19. This is a diagram of creep. The hillside slowly slips over many years from temperature or water.
  17. 20. and Deposition Water erosion
  18. 22. 5. Water cycle- Each part of the cycle drives the other parts.
  19. 23. A.____________- water changing to water vapor evaporation
  20. 24. 1) ____________________ - evaporation from ice ; sublimation
  21. 25. 2) __________ Evaporation from plants transpiration
  22. 26. B. _ - changing water vapor into liquid form condensation
  23. 27. C. ___________- liquid or solid form of water falling to Earth pre cipitation
  24. 28. 6.________-rainwater that does not soak into the ground or evaporate runoff
  25. 29. groundwater 7.___________water that sinks (leaches) into the porous parts of Earth’s crust (about 90% of all fresh water)
  26. 30. 8. ________________- an underground area that has been eroded by _____________________ (carbonation) cave or cavern chemical weathering
  27. 31. 9._____________- “V” icicle-like structures formed by calcium carbonate left behind from dripping water stalactite
  28. 32. 10. _________ - “^ ” deposits of calcium carbonate that build up on the floor of a cave or cavern. stalagmite
  29. 33. GLACIERS
  30. 35. glacier- a thick river of ice that moves slowly across land 11. _______
  31. 36. A.________- plucking rocks freeze in cracks under the ice and are dragged along
  32. 37. abrasion scouring of bedrock by imbedded rocks B. ___________
  33. 38. scratches made on the bedrock by the imbedded rocks striations C. _________-
  34. 39. unsorted, mixture of different-sized sediments left by a glacier till 12. __-
  35. 40. ridges of broken rock pieces left on the sides and at the end of a glacier moraine 13. ________-
  36. 41. mass coverage of land area (Ice Age, Antarctica) continental glacier 14. _______________-
  37. 42. valley glacier ice flows from high altitudes down a mountain 15. _________-
  38. 43. 16. Importance of Glaciers <ul><li>They have carved out many geological </li></ul><ul><li>features, like mountains and valleys. </li></ul><ul><li>B. They deposited much of the sand and </li></ul><ul><li>gravel that is used for construction </li></ul><ul><li>purposes. </li></ul>
  39. 44. 17. Erosion by Waves A. ___________- part of the coast that sticks out into the ocean B. ________- area of wave-washed sediment along the coast headland beach
  40. 45. C. _______- beach that projects like a finger out into the water D. __________________- sediment moves down the beach with the current spit longshore drift
  41. 46. Wind Erosion 18.
  42. 47. deflation- Removal of loose A. material from ground’s surface
  43. 49. <ul><li>scouring action of particles carried by the wind (like___________ ) </li></ul>sand blasting abrasion- B.
  44. 51. 19. Wind Deposition
  45. 52. loess- wind-blown deposits of ______ fine dust particle that often pack into layers; soft, like talc A.
  46. 54. dunes- mounds of sand drifted downwind (most common wind deposit) B. by the wind, which migrate
  47. 55. The End

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