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Erosion
Erosion
Erosion
Erosion
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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: <ul><li>TRANSPORT OF SEDIMENTS </li></ul>
    • 3. AND DEPOSITING THEM ELSEWHERE
    • 4.  
    • 5. EROSION IS DRIVEN BY THE FORCE OF GRAVITY
    • 6. THE AGENTS OF EROSION ARE: <ul><li>RUNNING WATER </li></ul><ul><li>WIND </li></ul><ul><li>MOVING ICE (GLACIERS) </li></ul>
    • 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: <ul><li>PARTICLES ARE CARRIED IN SEVERAL WAYS DEPENDING ON THEIR </li></ul><ul><li>SIZE </li></ul>
    • 21. THREE ways streams transport sediment:
    • 22. SEDIMENTS IN SOLUTION : <ul><li>DISSOLVED IONS </li></ul>
    • 23. examples : <ul><li>Salt </li></ul><ul><li>calcite </li></ul>
    • 24. Dissolved ions in solution
    • 25. SEDIMENTS IN SUSPENSION : COLLOIDS
    • 26. Can you think of examples : <ul><li>SILT </li></ul><ul><li>CLAY </li></ul>
    • 27.  
    • 28. SEDIMENTS ROLLED AND BOUNCED: <ul><li>LARGE SEDIMENTS dragged along the bottom </li></ul>
    • 29.  
    • 30. VELOCITY OF A STREAM DEPENDS ON: <ul><li>SLOPE (GRADIENT) AND </li></ul><ul><li>DISCHARGE </li></ul><ul><li>volume of water </li></ul>
    • 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 ________ <ul><li>SORTED </li></ul><ul><li>dropped off in size order </li></ul>
    • 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: <ul><li>DRY CLIMATES </li></ul>
    • 50. The particles transported (eroded) by wind are _________ <ul><li>Sorted </li></ul>
    • 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: <ul><li>When more snow in winter accumulates than _______ in the summer the snow at the bottom turns to _________. </li></ul>melts ice gravity advance <ul><li>If it becomes thick enough, it’s weight will cause it to move under the pull of___________. </li></ul><ul><li>This is called a glacial _________ </li></ul>
    • 58.  
    • 59.  
    • 60.  
    • 61.  
    • 62. <ul><li>1.Glaciers create </li></ul><ul><li>U- shaped valleys </li></ul>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. <ul><li>2. Sediments left behind by glaciers are </li></ul>STRIATIONS SHOW THE DIRECTION OF MOVEMENT OF THE GLACIER polished & striated (scratched)
    • 74.  
    • 75. 3. SEDIMENTS LEFT BEHIND BY GLACIERS ARE: <ul><li>UNSORTED </li></ul>
    • 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. <ul><li>Some Glacial Features include : </li></ul><ul><li>U-shaped valleys </li></ul><ul><li>Moraines: unsorted sediments </li></ul><ul><li>Drumlins: elongated moraines </li></ul><ul><li>kettle lakes: round glacial lake </li></ul><ul><li>finger lakes: elongated glacial lake </li></ul><ul><li>outwash plains: deposited by melt-water streams </li></ul><ul><li>Erratic: large rock </li></ul><ul><li>deposited by a glacier </li></ul><ul><li>Escarpment: steep cliff </li></ul><ul><li>Horn: sharp peak </li></ul>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

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