The document discusses different types of erosion caused by various agents. It describes how running water, wind, and glaciers each produce distinctive erosion features. It also explains the different ways sediments are transported by streams, including in solution, suspension, and being rolled along the stream bed. Glacial erosion leaves behind unsorted sediments and landforms like U-shaped valleys, striations, and kettle lakes.

1. EROSION

2. EROSION: TRANSPORT OF SEDIMENTS

3. AND DEPOSITING THEM ELSEWHERE

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 :

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

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

28. SEDIMENTS ROLLED AND BOUNCED: LARGE SEDIMENTS dragged along the bottom

30. VELOCITY OF A STREAM DEPENDS ON: SLOPE (GRADIENT) AND DISCHARGE volume of water

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

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:

49. EROSION BY WIND OCCURS PRIMARILY IN: DRY CLIMATES

50. The particles transported (eroded) by wind are _________ Sorted

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 _________

62. 1.Glaciers create U- shaped valleys Characteristics of Glacial Erosion:

66. escarpment U-shaped valley

69. Advancing glacier

70. Retreating glacier

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)

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

87. Terminal end of advancing glacier Latest advance Melt-water carrying sorted Sediment toward the ocean

89. THE SOUTH SHORE OF LONG ISLAND

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)

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