Catastrophic flood - Glacial Lake Missoula Giant ripple marks from catastrophic flood.

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Presentation transcript:

Catastrophic flood - Glacial Lake Missoula

Giant ripple marks from catastrophic flood

Ice shelves - what are they? How do they form? Why are they important?

Ice shelves - what are they? Floating icesheet - form in center of continent and move out under own weight Why are they important? Hold back glaciers/icesheets What has happened recently to ice shelves? Which would be most vulnerable?

Larsen Ice shelf Gone 2002 Wilkins 2008

1/31/02 Larsen B Ice Shelf, Antaractic Peninsula

2/17/02

2/23/02

Adelie penguin populations are declining abruptly in the Antarctic Peninsula, where populations of other penguins occurring farther north are growing From National Geographic, 9/04, p. 17