1. How do Glaciers affect the land? WED V17

2. What is a glacier? 0 A large, long-lasting mass of ice which forms on land and moves downslope because of gravity.

3. What metaphors do we use for glaciers? 0 Glaciers are often referred to as a River of Ice or 0 Bulldozer of Ice

5. How do glaciers form?

6. http://library.thinkquest.org/3876/images/howgla.gif

7. How do glaciers form? Glaciers form over many years in places where the snowfall in winter exceeds the snow melt in summer Gravity pulls the ice down the hill

8. http://www.swisseduc.ch/glaciers/earth_icy_planet/icons-11/20.jpg

10. What are the two types of glaciers? Alpine and Continental

11. Alpine Glaciers 0 A.k.a. Valley Glaciers 0 form near mountain tops and slide down the valleys 0 They can be hundreds of feet thick.

12. Tyndall Glacier, Alaska

13. Aletsch Glacier, Switzerland 115 sq miles http://travelguide.all-about-switzerland.info/pictures-famous-swiss-glaciers.html

14. Continental Glaciers

15. 0 cover large areas (Antarctica, Canada) 0 can be 2 – 3 miles thick

16. 0 Weight of the ice depresses the ground 0 When these glaciers melt the land ‘rebounds’ 0 Some areas depressed during the last ice age are still rising

17. http://www.prolitegear.com/prolitegear/images/large/antarctica_02_lg.jpg

18. http://exposedplanet.com/images/antarctica-group-sled-vinsonbc-camp1.jpg

19. http://exposedplanet.com/images/mountain-rangefrom-ph-antarctica.jpg

20. What are the Landscape Features of Glaciated Areas?

21. What are the landscape features left by Alpine or mountain glaciers? 0 Till- direct deposit of glacier; unsorted sediment 0 Mountain shape: 0 Rugged landscapes 0 Jagged peaks 0 U-shaped valley 0 Moraine- a mass of till

22. Rugged Landscapes Jagged Peaks

23. Northeast-looking oblique aerial photograph showing the snow-covered summit accumulation area of Mount Fairweather, Fairweather Range, Glacier Bay National Park, Alaska.

24. Materhorn http://www.kuleuven.ac.be/geologie/geo-algemeen.html

25. West-looking photograph showing an angular arete ridge, composed of schist, on the upper Taku Glacier, Juneau Icefield, Tongass National Forest, Coast Mountains, Alaska.

26. U-Shaped Valley

27. http://www.nps.gov/history/history/online_books/brochures/1936/glac/ima ges/fig13c.jpg River ValleyGlacial Valley

28. Moraine 0 Mass of till (unsorted sediment) left by a glacier

29. http://www.yosemite.ca.us/library/geologic_story_of_yosemite/images/62.jpg

30. The u-shaped valley to the right side of the photo is the ice-free valley of Talkeetna Glacier, Talkeetna Mountains, Alaska. Note cirque at the top of the valley on the left.

31. Aletsch Glacier, Switzerland http://travelguide.all-about-switzerland.info/pictures-famous-swiss-glaciers.html

34. Ground Moraine

35. Terminal Moraine

36. Mendenhall Glacier, Tongas National Park

37. What are the characteristics left by Continental Glaciers? 0 Valleys- u shaped 0 Till - unsorted sediment 0 Kettle lakes 0 Scratches and grooves 0 Drumlins

38. Kettle Lake http://www.scienceclarified.com/images/uesc_06_img0334.jpg

40. http://dnr.metrokc.gov/wlr/waterres/smlakes/LakeStewWeb25/GeoDrawing.JPG

41. Finger Lakes 0 streams and lakes were modified by glaciers 0 Retreating glaciers deposited recessional moraines that blocked the water flow and created deep lakes 0 Examples 0 Seneca lake: 40 miles long, 618 feet deep 0 Cayuga: 40 miles long, 435 feet deep

42. http://upload.wikimedia.org/wikipedia/commons/5/5f/Fingerlakesmap.png

43. NASA photo

44. Striations (Scratches) http://images.google.com/imgres?imgurl=http://education.usgs.gov/schoolyard/IMAGES/GlacialStriations2.jpg&imgrefurl=http://educatio n.usgs.gov/schoolyard/CoolGeologyActivity.html&h=297&w=447&sz=45&hl=en&start=1&tbnid=y1qmEFaxgJ64ZM:&tbnh=84&tbnw=12 7&prev=/images%3Fq%3Dglacial%2Bstriations%26gbv%3D2%26svnum%3D10%26hl%3Den

45. Grooves

46. Polished Rock http://3dparks.wr.usgs.gov/nyc/images/fig21.jpg

47. Drumlin http://oz.plymouth.edu/~sci_ed/Turski/Courses/Earth_Science/Images/4.drumlin.jpg

48. http://geoscape.nrcan.gc.ca/calgary/geotour/6_e.php

49. A SWARM OF DRUMLINS http://www.drumlinarealandtrust.org/images/drumlins.jpg

51. Icebergs Form when chunks of ice ‘calve’ off the front of the glacier and land in the water

52. http://images.google.com/imgres?imgurl=http://www.atacamaphoto.com/antarctica/antarctica22.jpg&imgrefurl=http://www.atacamaphoto.com/antarctica/antarctica22.htm&h=408&w=608&s z=101&hl=en&start=37&tbnid=raJxaBCeP2TyMM:&tbnh=91&tbnw=136&prev=/images%3Fq%3Dantarctica%26start%3D20%26gbv%3D2%26ndsp%3D20%26hl%3Den%26sa%3DN

53. Iceberg in Antarctica

54. Floating Icebergs

55. A Zodiak is cruising along a glacier front, showing the tremendous size of the ice blocks

56. Giant Iceberg

57. Gentoo penguin family, Antarctica

58. What are the tell-tale signs that a glacier was in the area? 0 ________________ valley 0 ________________ sediment 0 ________________ in bedrock

59. See you in class!