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Mystery of the Megaflood
Companion website to a Public Broadcasting Service (PBS) NOVA program exploring "the evidence for a huge catastrophe that struck eastern Washington State thousands of years ago. It took scientists decades to figure out that a colossal flood had carved out bizarre landscape features strewn across thousands of square miles." Includes opinions from geologists, images, a geology quiz, and related resources.
http://www.pbs.org/wgbh/nova/megaflood/

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