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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