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How do Glaciers affect the land?

How do Glaciers affect the land?. WED V17. What is a glacier?. A large, long-lasting mass of ice which forms on land and moves downslope because of gravity. What metaphors do we use for glaciers?. Glaciers are often referred to as a River of Ice or Bulldozer of Ice. How do glaciers form?.

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How do Glaciers affect the land?

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  1. How do Glaciers affect the land? WED V17

  2. What is a glacier? • 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? • Glaciers are often referred to as a River of Iceor • Bulldozerof Ice

  4. How do glaciers form?

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

  6. 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

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

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

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

  10. Tyndall Glacier, Alaska

  11. Aletsch Glacier, Switzerland115 sq miles http://travelguide.all-about-switzerland.info/pictures-famous-swiss-glaciers.html

  12. Continental Glaciers

  13. Continental Glaciers • cover large areas (Antarctica, Canada) • can be 2 – 3 miles thick

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

  15. http://www.prolitegear.com/prolitegear/images/large/antarctica_02_lg.jpghttp://www.prolitegear.com/prolitegear/images/large/antarctica_02_lg.jpg

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

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

  18. What are the Landscape Features of Glaciated Areas?

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

  20. Rugged LandscapesJagged Peaks

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

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

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

  24. U-Shaped Valley

  25. River Valley Glacial Valley http://www.nps.gov/history/history/online_books/brochures/1936/glac/images/fig13c.jpg

  26. Moraine • Mass of till (unsorted sediment) left by a glacier

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

  28. 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.

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

  30. Ground Moraine

  31. Terminal Moraine

  32. Mendenhall Glacier, Tongas National Park

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

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

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

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

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

  38. NASA photo

  39. Striations (Scratches) http://images.google.com/imgres?imgurl=http://education.usgs.gov/schoolyard/IMAGES/GlacialStriations2.jpg&imgrefurl=http://education.usgs.gov/schoolyard/CoolGeologyActivity.html&h=297&w=447&sz=45&hl=en&start=1&tbnid=y1qmEFaxgJ64ZM:&tbnh=84&tbnw=127&prev=/images%3Fq%3Dglacial%2Bstriations%26gbv%3D2%26svnum%3D10%26hl%3Den

  40. Grooves

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

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

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

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

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