GLACIATION WEB EXERCISE

For page 7 of your portfolio:
Go to http://www.glacier.rice.edu/
Click on "Ice", then "Movement"
1. Of the three types of movement listed, which one is not covered in our course or the textbook?
Briefly describe this process.
2.What role does water play in basal sliding?
3. The lecture (or textbook) uses what term for "Internal Deformation ?"
Go to "Ice & Landscape" (listed on the left side) then "Glacial erosion (subglacial)"
4. What is the distinction between plucking and abrasion?
5. Explain how a glacier works as a conveyor belt.
Go back and find and click on "Subglacial Depositional Features."
6. Explain what eskers are and how they form.
Go to http://www.museum.state.il.us/exhibits/ice_ages/laurentide_deglaciation.html
Download the video clip and watch the retreat of the North American ice sheet during the last ice age. The clip starts at the height of glaciation 18,000 years ago (18 kya).
7. What does it show for Alaska at this time?
Run the video clip several times. Now move it by clicking and moving the bar.
8. How long ago (kya) did the ice sheet clear the United States' northern border with Canada during the retreat?
Go to: http://www.crevassezone.org/
This is the Juneau Ice Field Research Institute's page. Click on "Photo Galllery" and scroll through the photos. Look for cirque, horn, crevasse, arete. When you get to terminal moraine photo, click to enlarge it.
9. When was the glacier last at the terminal moraine (where the people are standing)?
Continue scrolling through the photos. Especially interesting is the large boulder that fell on the glaciers hours before the photo was taken.

Page 8:
1. Take the end of chapter quiz. Note your score for the multiple choice portion and the date you took it.
2. Take the multiple choice quiz on the web site. Note your score and the date you took it.
3. Take the matching quiz on the web site. Note your score and the date you took it.

Run the 4 animations for glaciers. These are helpful for understanding the concepts that you need to know. Do not write anything in your journal about this.