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Crater Lake National ParkWestern Pasque Flowers on the rim of Crater Lake
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Crater Lake National Park
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Did You Know?
Crater Lake was formed when a massive eruption of Mount Mazama 7700 years ago caused the mountain to collapse, leaving a steaming caldera. Centuries of rain and snow filled the caldera creating Crater Lake.

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Last Updated: July 25, 2006 at 00:22 EST