1. Glaciers Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–1

2. Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–2 Formation of Glacial Ice from Snow

4. Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–4 Figure 15-5 Mechanics of Glacial Flow

5. Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–5 Deeply Crevassed Davidson Glacier near Haines, Alaska Source: Breck P. Kent

6. Crevasses Video: CrevassesEssentials of Geology, 15a–6

7. Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–7 Types of Glaciers (cont’d) –

8. Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–8 Types of Glaciers (cont’d) – Angel Glacier Source: Comstock

9. Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–9 Types of Glaciers (cont’d) – Valley (Alpine) Glacier Source: Tom Bean

10. Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–10 Types of Glaciers (cont’d) – Icecap Source: Betty Crowell/Faraway Places

11. Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–11 Types of Glaciers (cont’d) – Tidewater Glacier Source: Jim Wark/Peter Arnold, Inc.

12. Continental Glacier Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–12

13. Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–13 Glacial Erosion

15. Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–15

16. Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–16

18. Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–18

19. Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–19

20. Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–20

21. Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–21

22. Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–22

23. Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–23

24. Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15a–24

25. Deposition by Glaciers Till - a mixture (unsorted) of boulders, sand, clay and silt. Glaciers have filled entire valleys w/ till making them flat. Outwash - material deposited by the glacier as it melts, similar to river deposits. Outwash is sorted or separated by the size of its particles. (boulder, gravel, sand, silt)

26. lateral moraine medial moraine

27. Till Erosion Moraine - mounds of materials deposited along the sides, in the middle or at the end of the glacier as it stops moving & begins to melt.

28. Till Erosion Erratic – Large boulders dropped by glaciers

29. Outwash Large Sediment Med Sediment Small Sediment http://www.classzone.com/books/earth_science/terc/content/visualizations/es1303/es1303pa ge01.cfm?chapter_no=visualization Glacier melting

30. Depositional Features (continental glaciers)

31. Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15c–31 How do Ice ages occur? Land bridge Formation

32. http://www.classzone.com/books/earth_science/terc/content/visualization s/es1506/es1506page01.cfm?chapter_no=visualizationEssentials of Geology, 15c–32 Milankovitch Cycles

33. Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15c–33 Milankovitch Cycles (cont'd)

34. Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15c–34 Milankovitch Cycles (cont'd)

35. Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15c–35 Milankovitch Cycles (cont'd)

36. Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15c–36 Changes In Global Climate During the Cenozoic Era

37. Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15c–37 Effects of North American Ice Sheet

38. Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15c–38 Geology at a Glance The Work of Continental Glaciers

39. Copyright © Houghton Mifflin Company. All rights reserved.Essentials of Geology, 15c–39 Geology at a Glance The Work of Alpine Glaciers