Antarctic Mysteries

Interactive Crevasse Tracking

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Drygalski Ice Tongue

This 20 km wide slab of floating ice pushes into the Ross Sea, fed by the David Glacier draining a large part of Victoria Land, East Antarctica. This icy appendage continues to grow while the sea eats away at the ragged sides of the tongue. It may take decades before some or all of the tongue snaps off creating a new iceberg and restarting the process. The broad scars across the tongue are formed far upstream on the David Glacier and provide markers to help measure the flow speed.

Dates: December 15, 1988 - December 4, 2002
Movement Direction: Right to Left

To use the applet:
1. Click the "Distance over Time" icon, so that it turns red.
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2. Find a distinct location on the image above, and click it with the mouse cursor to leave a yellow

crosshair as a marker. Need help choosing a point?
3. Click the "Next" icon.
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4. Find the same distinct location on the new map, and click it with your mouse cursor. This will calculate
the average distance over time (meters over years).
5. You may use the "Erase" icon to start over.
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This page utilizes a Reusable Content Object from the Satellite Observations in Science Education project.