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Glaciers

Glaciers. I. Origin of Glaciers. Definition. I. Origin of Glaciers. Definition Originates on land. I. Origin of Glaciers. Definition Originates on land Forms from the accumulation, compaction, and recrystallization of snow. I. Origin of Glaciers. Definition Originates on land

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Glaciers

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  1. Glaciers

  2. I. Origin of Glaciers • Definition

  3. I. Origin of Glaciers • Definition • Originates on land

  4. I. Origin of Glaciers • Definition • Originates on land • Forms from the accumulation, compaction, and recrystallization of snow

  5. I. Origin of Glaciers • Definition • Originates on land • Forms from the accumulation, compaction, and recrystallization of snow • Survives year-to-year

  6. I. Origin of Glaciers • Definition • Originates on land • Forms from the accumulation, compaction, and recrystallization of snow • Survives year-to-year • Moves under its own weight

  7. I. Origin of Glaciers B. Elevation required

  8. I. Origin of Glaciers B. Elevation required sea level 18,000 ft. 10,000 ft. sea level

  9. I. Origin of Glaciers C. Mechanism of Formation

  10. Snow C. Mechanism of Formation Firn Ice Glacial Ice

  11. I. Origin of Glaciers D. Behavior of Flow

  12. D. Behavior of Flow • Plastic Flow

  13. D. Behavior of Flow 2. Basal Sliding (Slip)

  14. D. Behavior of Flow 2. Basal Sliding (Slip)

  15. D. Behavior of Flow 3. Zone of Fracture (behaves as a brittle solid) crevasses

  16. D. Behavior of Flow 3. Zone of Fracture

  17. II. Types of Glaciers A. Alpine Glaciers

  18. II. Types of Glaciers B. Continental Glaciers

  19. III. Glacial Movement • Two distinctive zones on glaciers:

  20. III. Glacial Movement Zone of accumulation

  21. III. Glacial Movement Zone of ablation

  22. III. Glacial Movement • Accumulation vs. ablation determines movement

  23. III. Glacial Movement • Accumulation vs. ablation determines movement

  24. IV. Glacial Erosion A. Processes for erosion

  25. IV. Glacial Erosion 1) Plucking –

  26. Plucking

  27. IV. Glacial Erosion 2) Abrasion

  28. IV. Glacial Erosion Glacial Striations

  29. IV. Glacial Erosion Glacial Polish

  30. IV. Glacial Erosion 3) Bulldozing –

  31. V. Erosional Landforms

  32. V. Erosional Landforms

  33. V. Erosional Landforms

  34. V. Erosional Landforms

  35. A) Cirques –

  36. A) Cirques……and Tarns

  37. V. Erosional Landforms

  38. 2) Arete

  39. V. Erosional Landforms

  40. 3) Horn –

  41. V. Erosional Landforms

  42. 4) U-shaped valley

  43. V. Erosional Landforms

  44. 5) Hanging valley

  45. 5) Hanging valley

  46. V. Erosional Landforms

  47. 6) Fjords –

  48. 6) Fjords –

  49. VI. Depositional Landforms

  50. VI. Depositional Landforms A) Moraines • Some of the varieties….

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