Extreme Ice Survey
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Teaching Tips | Science | Pedagogy |
- Should be used with other related videos and background materials on the Extreme Ice Survey website.
- This short clip can be shown in conjunction with any discussion on the impacts of global warming. There will be a need to describe how the motion of glaciers today are different from the motions in the past (use Google Scholar and search on "climate change" glaciers).
- Many more of this type of video can be found at: http://www.extremeicesurvey.org/index.php/new_gallery/
About the Science
- Dr. Tad Pfeffer of INSTAAR describes recent changes in the Columbia Glacier in Alaska.
- During most of the two-year span of the video, the ice is moving at a pretty good clip of about 50 to 80 feet (15 to 24 meters) a day.
- The cracks and fissures running sideways across the glacier are crevasses formed when the ice stretches and breaks in its effort to keep up with the accelerating downward pace.
- Transverse crevasses are an indicator of ice being stretched along the flow direction.
- The dark, curvy stripes that run along the sides of the glacier are medial moraines—channels of debris left behind where branch glaciers joined the main glacier in its flow.
- Passed initial science review - expert science review pending.
About the Pedagogy
- One of several complementary time-lapse videos of the Columbia glacier and other Arctic glaciers.
Related URLs These related sites were noted by our reviewers but have not been reviewed by CLEANParent URL: http://www.extremeicesurvey.org/index.php/new_gallery/
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