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August 29, 2017 · 2:15 PM EDT
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Crater Lake in Oregon is a prime example of a large caldera, the huge hole in the ground created by an ancient volcanic eruption. Calderas typically fill with water over millions of years and form pristine lakes. Their sediment may be a future source of the important element lithium.
National Park Service
In Science, Tech & EnvironmentTechnologyScience.
Tagged: United StatesOregon.
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