1 / 71

1.4 Understand how moving ice acts as an agent of erosion and deposition. (Chap. 2)

1.4 Understand how moving ice acts as an agent of erosion and deposition. (Chap. 2). There are two types of glaciation. Alpine Glaciation Continental Glaciation. Distinguish between the terms alpine glaciation and continental glaciation. (P.32). Alpine Glaciation.

nen
Download Presentation

1.4 Understand how moving ice acts as an agent of erosion and deposition. (Chap. 2)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. 1.4 Understand how moving ice acts as an agent of erosion and deposition. (Chap. 2) There are two types of glaciation. • Alpine Glaciation • Continental Glaciation

  2. Distinguish between the terms alpine glaciation and continental glaciation. (P.32)

  3. Alpine Glaciation • Alpine glaciers form high in mountain valleys; above the snow-line

  4. C E D B A Alpine Glaciation

  5. Continental Glaciation • Continental glaciers cover parts of continental land masses; ex Greenland

  6. Similarities Both move and cause erosion Both change the landscape Both developed in constantly cold < 0 0C Differences Location Alpine = mountain Continental = earth poles Size Alpine = smaller Continental = larger Distinguish between the terms alpine glaciation and continental glaciation. (P.32)

  7. Define the terms outwash plain, terminal moraine, erratics, drumlins & eskers. (P. 33 Q.12) • These features are associated with continental glaciation. • See picture p. 34

  8. Outwash plain • Similar to a river delta • Melt water flowing from the glacier deposits silt • Deposited in layers • Small particles carried further away • Larger particles drop closer to the glacier Outwash plain

  9. Outwash Plain

  10. Continental…Outwash plain Outwash Plain

  11. Continental…Outwash plain

  12. Continental…Outwash plain

  13. Terminal moraine • Heap or ridge of bulldozed gravel that marks the end of the forward motion of a glacier • As glacier retreats it deposits debris/gravel • P. 34

  14. Continental…Terminal Moraine Terminal Moraine Outwash Plain

  15. Continental…Terminal Moraine

  16. Erratics • Large boulders that were transported long distances and dropped • They now sit in a region and look very much out-of-place. • P. 34

  17. Erratic

  18. Erratic

  19. Continental…Erratic Terminal Moraine Outwash Plain Erratic

  20. Drumlins p. 34 • Egg shaped hill • Formed under glaciers • Sloped or Pointy end points in direction of ice flow

  21. Drumlins p. 34 • Formation • Ice melts under glacier • Deposits of gravel made • Glacier moves forward • Deposits are bull-dozed along and catches up in rough areas forming piles or drumlins.

  22. Drumlin What direction did the glacier move?

  23. Continental…Drumlin Drumlins Terminal Moraine Outwash Plain Erratic

  24. Esker p. 34 • Long deposits of eroded glacial material • Formed by sub-glacial streams that deposit material like all rivers. • Highways of the North!!

  25. Esker

  26. Esker

  27. Continental…Esker Drumlins Terminal Moraine Esker Outwash Plain Erratic

  28. Examine evidence for the direction of movement of glaciers. (P. 34 question # 13) • Sloped end of drumlin • Location of terminal moraine • What is direction of glacier movement in this picture?

  29. Continental…Outwash Plain

  30. Define the terms cirque, arête, hanging valley, lateral moraine, and terminal moraine. (P. 36) • These features are associated with alpine glaciers

  31. Alpine glaciers • Alpine glaciers are like very slow moving rivers of ice flowing down high mountain valleys.

  32. Cirque (p. 36) • a circular hollow cut into bedrock during glaciation • Side and back walls are steep but front wall opens downward

  33. Cirque - How formed? • Alpine glacier freezes onto mountain valley and as is proceeds it plucks rock from the mountain top leaving the cirque shape.

  34. C E D Cirque B A

  35. Cirque

  36. Arête p. 36 • Steep, jagged, narrow, knife edged ridge between two cirques or glacier valleys.

  37. Arete C E D Cirque B A

  38. Arête

  39. Truncated Spur • Blunt-ended ridge of rock jutting from the side of a glacial trough, or valley

  40. Arete C E D Cirque B Truncated spurs A

  41. Horn or Pyramidal Peak • is a mountaintop (peak) that has been modified by the action of ice during glaciation.

  42. Arete C E Horn D Cirque B Truncated spurs A

  43. Horn

  44. Hanging Valley • A high level tributary valley from which the ground falls sharply to the level of the lower, main valley. • The depth of the lower valley is due to more severe glaciation. Most noticeable once glacier has melted!

  45. Hanging Valley

  46. Hanging Valley

  47. Hanging Valley in Newfoundland • Hanging Valley in Gros Morne National park . • Trout River pond

  48. Lateral Moraine • Moraine means 'rock waste'.It is also known as glacial till • Lateral Moraine is the land-form deposited at the side of a glacier • Debris/waste rock drops off the side of the mountain as the glacier moves forming a ridge of debris at the outer-sides of the glacier.

More Related