Weathering For Sci 8

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Weathering For Sci 8

  1. 1. statue Grand Canyon Sand Pile What do These 3 Things Have in Common??
  2. 2. They have all been subjected to the process of WEATHERING
  3. 3. weathering
  4. 4. WEATHERING : is <ul><li>THE CHEMICAL </li></ul><ul><li>AND PHYSICAL </li></ul><ul><li>PROCESS THAT </li></ul><ul><li>CHANGES ROCK </li></ul>
  5. 5. For weathering to occur the rocks must be exposed to: WATER (hydrosphere) AIR (atmosphere) ACTION OF HUMANS & OTHER LIVING ORGANISMS
  6. 6. Evidence of Weathering: the end product of the weathering of rock is SEDIMENT
  7. 7. PHYSICAL WEATHERING: <ul><li>ROCKS ARE BROKEN INTO SMALLER PIECES WITHOUT CHANGING THE </li></ul>CHEMICAL NATURE OF THE ROCK
  8. 8. Explain how water and wind can can cause physical weathering in the following ways:
  9. 9. The alternate freezing and thawing of water
  10. 10. WATER EXPANDS WHEN IT FREEZES This is called…….
  11. 11. Ice Wedging or Frost Action
  12. 12. a weathered sidewalk
  13. 13. Half Dome in Yosemite California
  14. 14. *ABRASION
  15. 15. <ul><li>RUNNING WATER AND WIND CAN RUB OR WEAR DOWN ROCKS </li></ul>
  16. 17. RUNNING WATER AND WIND CAN CAUSE ROCKS TO RUB AGAINST EACH OTHER AND WEAR THEM DOWN
  17. 18. * BIOLOGIC ACTIVITY
  18. 19. A sidewalk being lifted by the tree roots!!
  19. 21. PLANT ROOTS EXPOSES NEW SURFACES TO WEATHERING
  20. 22. *Humans can influence the rate of weathering by the use of powerful equipment
  21. 23. If you increase the surface area you will ___________ the rate of weathering increase
  22. 24. Surface area rate of weathering
  23. 25. CHEMICAL WEATHERING : <ul><li>Rocks are broken and </li></ul><ul><li>the chemical composition is also ___________ </li></ul>CHANGED
  24. 26. <ul><li>OXIDATION OCCURS WHEN __________ FROM AIR COMBINES WITH ___________ TO FORM OXIDES </li></ul>OXYGEN MINERALS RUST
  25. 27. This was washed up on a beach!!
  26. 28. A rusty gate……
  27. 29. <ul><li>CARBONATION </li></ul><ul><li>OCCURS WHEN __________ CONTAINING </li></ul><ul><li>__________ ACID </li></ul><ul><li>DISSOLVES MINERALS </li></ul>WATER CARBONIC
  28. 30. EX. LIMESTONE CAVES
  29. 33. * POLLUTANTS can speed up the rate of chemical weathering <ul><li>OXIDES OF SULFER </li></ul><ul><li>AND NITROGEN MAKE </li></ul><ul><li>RAINWATER UNNATURALLY </li></ul><ul><li>ACIDIC </li></ul><ul><li>ACID RAIN </li></ul>
  30. 34. <ul><li>HYDRATION </li></ul><ul><li>OCCURS WHEN _______ SUCH AS MICA AND FELDSPAR ABSORB ________ AND WEAKEN AND FORM ________ </li></ul>MINERALS WATER CLAY
  31. 36. CLIMATIC EFFECTS ON WEATHERING : <ul><li>PHYSICAL WEATHERING DOMINATES IN </li></ul>COLD, MOIST CLIMATES
  32. 37. CLIMATIC EFFECTS ON WEATHERING: <ul><li>CHEMICAL WEATHERING DOMINATES IN </li></ul>WARM, MOIST CLIMATES
  33. 38. IN GENERAL WHEN THERE IS MORE THERE IS MORE WEATHERING MOISTURE
  34. 39. CLEOPATRA’S NEEDLE Central Park
  35. 40. RATE OF WEATHERING ALSO DEPENDS ON: MINERAL COMPOSITION ROCK RESISTANCE (HARDNESS)
  36. 42. SHALE SANDSTONE SHALE SANDSTONE LIMESTONE SHALE DOLOSTONE WHICH ROCK IS THE MOST RESISTANT TO WEATHERING? WATER
  37. 43. SHALE SANDSTONE SHALE SANDSTONE LIMESTONE SHALE DOLOSTONE WHICH ROCK IS THE MOST RESISTANT TO WEATHERING?
  38. 44. SHALE SANDSTONE SHALE SANDSTONE LIMESTONE SHALE WHICH ROCK IS THE LEAST RESISTANT TO WEATHERING? DOLOSTONE
  39. 45. SHALE SANDSTONE SHALE SANDSTONE LIMESTONE SHALE WHICH ROCK IS THE LEAST RESISTANT TO WEATHERING? DOLOSTONE
  40. 46. SOIL FORMATION: SOIL IS THE COMBINATION OF: ROCK PARTICLES MINERALS ORGANIC MATTER
  41. 47. THE END RESULT OF WEATHERING AND BIOLOGIC ACTIVITY IS: soil
  42. 48. Adding to a compost pile
  43. 51. EROSION
  44. 52. EROSION: <ul><li>TRANSPORT OF SEDIMENTS </li></ul>
  45. 53. AND DEPOSITING THEM ELSEWHERE
  46. 55. EROSION IS DRIVEN BY THE FORCE OF GRAVITY
  47. 56. THE AGENTS OF EROSION ARE: <ul><li>RUNNING WATER </li></ul><ul><li>WIND </li></ul><ul><li>MOVING ICE (GLACIERS) </li></ul>
  48. 57. Each Agent of Erosion Produces it’s Own Characteristic shape and Texture in the Sediment :
  49. 59. ROUNDS AND SMOOTHES THE ROCK SURFACE ALSO MAKES IT SMALLER
  50. 60. WIND BLOWN SEDIMENTS FROST AND PIT THE ROCK SURFACE
  51. 61. SMALL SEDIMENTS IN THE GLACIER POLISHES & SMOOTHES THE ROCK SURFACE LARGE SEDIMENTS SCRATCH AND STRIATE THE ROCK SURFACE
  52. 62. FALLEN ROCKS ARE SHARP & ANGULAR
  53. 63. RUNNING WATER The primary agent of erosion is:
  54. 64. Colorado River
  55. 65. Grand Canyon
  56. 66. Niagra Falls

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