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Erosion

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  • Merrill Snyder
  • Merrill ES Snyder Feather Hesser
  • Merrill Snyder
  • Merrill earth science Snyder Feather Hesser Glencoe
  • Transcript

    • 1. EROSION
    • 2. EROSION:
      • TRANSPORT OF SEDIMENTS
    • 3. AND DEPOSITING THEM ELSEWHERE
    • 4.  
    • 5. EROSION IS DRIVEN BY THE FORCE OF GRAVITY
    • 6. THE AGENTS OF EROSION ARE:
      • RUNNING WATER
      • WIND
      • MOVING ICE (GLACIERS)
    • 7. Each Agent of Erosion Produces it’s Own Characteristic shape and Texture in the Sediment :
    • 8.  
    • 9. ROUNDS AND SMOOTHES THE ROCK SURFACE ALSO MAKES IT SMALLER
    • 10. WIND BLOWN SEDIMENTS FROST AND PIT THE ROCK SURFACE
    • 11. SMALL SEDIMENTS IN THE GLACIER POLISHES & SMOOTHES THE ROCK SURFACE LARGE SEDIMENTS SCRATCH AND STRIATE THE ROCK SURFACE
    • 12. FALLEN ROCKS ARE SHARP & ANGULAR
    • 13. RUNNING WATER The primary agent of erosion is:
    • 14. Colorado River
    • 15. Grand Canyon
    • 16. Niagra Falls
    • 17.  
    • 18.  
    • 19.  
    • 20. EROSION BY WATER:
      • PARTICLES ARE CARRIED IN SEVERAL WAYS DEPENDING ON THEIR
      • SIZE
    • 21. THREE ways streams transport sediment:
    • 22. SEDIMENTS IN SOLUTION :
      • DISSOLVED IONS
    • 23. examples :
      • Salt
      • calcite
    • 24. Dissolved ions in solution
    • 25. SEDIMENTS IN SUSPENSION : COLLOIDS
    • 26. Can you think of examples :
      • SILT
      • CLAY
    • 27.  
    • 28. SEDIMENTS ROLLED AND BOUNCED:
      • LARGE SEDIMENTS dragged along the bottom
    • 29.  
    • 30. VELOCITY OF A STREAM DEPENDS ON:
      • SLOPE (GRADIENT) AND
      • DISCHARGE
      • volume of water
    • 31.  
    • 32.  
    • 33.  
    • 34.  
    • 35. Water moves faster on the outside of a bend EROSION Water moves slower on the inside of a bend DEPOSITION LABEL YOUR DIAGRAM (EROSION) & (DEPOSITION) EROSION DEPOSITION
    • 36. Erosion occurs at points Depsosition occurs at points B & E A & F A B C D F E
    • 37. B C D E F Maximum erosion occurs where there is maximum _____________ On a straight path the maximum velocity is in the ___________ below the ____________ center surface velocity
    • 38. EROSION OCCURS AT THE OUTSIDE DEPOSITION OCCURS AT THE INSIDE
    • 39.  
    • 40. THE MOVEMENT OF THE WATER CAN EVENTUALLY FORM AN OXBOW LAKE
    • 41. SEDIMENTS LEFT BEHIND BY STREAMS AND WIND ARE ________
      • SORTED
      • dropped off in size order
    • 42. CALCULATE THE MINIMUM VELOCITY OF A STREAM NEEDED TO CARRY A PEBBLE:
    • 43. (SEE REF. TABLE PAGE 6)
    • 44. APPROXIMATELY 50 CM/SEC
    • 45. WHAT IS THE MINIMUM VELOCITY NEEDED TO CARRY A BOULDER? 200 CM/SEC
    • 46. SORTING
    • 47. WIND:
    • 48.  
    • 49. EROSION BY WIND OCCURS PRIMARILY IN:
      • DRY CLIMATES
    • 50. The particles transported (eroded) by wind are _________
      • Sorted
    • 51.  
    • 52.  
    • 53.  
    • 54.  
    • 55.  
    • 56. Severe draughts in the mid-west during the 1920’s and 30’s caused this area to be known as the “Dust bowl”
    • 57. Glacial Erosion:
      • When more snow in winter accumulates than _______ in the summer the snow at the bottom turns to _________.
      melts ice gravity advance
      • If it becomes thick enough, it’s weight will cause it to move under the pull of___________.
      • This is called a glacial _________
    • 58.  
    • 59.  
    • 60.  
    • 61.  
    • 62.
      • 1.Glaciers create
      • U- shaped valleys
      Characteristics of Glacial Erosion:
    • 63.  
    • 64.  
    • 65.  
    • 66. escarpment U-shaped valley
    • 67.  
    • 68.  
    • 69. Advancing glacier
    • 70. Retreating glacier
    • 71.  
    • 72. Long Island Sound South Shore North Shore
    • 73.
      • 2. Sediments left behind by glaciers are
      STRIATIONS SHOW THE DIRECTION OF MOVEMENT OF THE GLACIER polished & striated (scratched)
    • 74.  
    • 75. 3. SEDIMENTS LEFT BEHIND BY GLACIERS ARE:
      • UNSORTED
    • 76. Advancing glacier MORE SNOW FALLS THAN MELTS
    • 77. Retreating glacier ICE BEGINS TO MELT DUE TO CLIMATE CHANGE
    • 78.  
    • 79.  
    • 80.  
    • 81.  
    • 82.  
    • 83.  
    • 84.  
    • 85.  
    • 86.  
    • 87. Terminal end of advancing glacier Latest advance Melt-water carrying sorted Sediment toward the ocean
    • 88.  
    • 89. THE SOUTH SHORE OF LONG ISLAND
    • 90.  
    • 91. Glacial Till F FOUND ON THE NORTH SHORE OF LONG ISLAND
    • 92. FASTEST VELOCITY IS AT THE CENTER OF THE VALLEY
    • 93. Some glacial features include: escarpment U-shaped valley
    • 94. drumlins outwash plain
    • 95.
      • Some Glacial Features include :
      • U-shaped valleys
      • Moraines: unsorted sediments
      • Drumlins: elongated moraines
      • kettle lakes: round glacial lake
      • finger lakes: elongated glacial lake
      • outwash plains: deposited by melt-water streams
      • Erratic: large rock
      • deposited by a glacier
      • Escarpment: steep cliff
      • Horn: sharp peak
      Drumlins outwash plain Kettle lakes
    • 96. River erosion: notice the V-shaped valleys and meanders (bending)
    • 97.  
    • 98. Valley glacier eroding a U-shape
    • 99. Glacial features left behind
    • 100. Glaciers / Rivers
    • 101. A B C A B C Match the cross sections below with the lines on the stream A B C