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See Photos Of ‘Ice Volcanoes,’ Circles On Lake Michigan

Photo: Ferry Keller
Photo: Ferry Keller
Photo: Ferry Keller
Photo: Ferry Keller
Photo: Wisconsin Department of Natural Resources
Photo: Wisconsin Department of Natural Resources
Photo: Wisconsin Department of Natural Resources
Photo: Wisconsin Department of Natural Resources
Photo: Wisconsin Department of Natural Resources
Photo: Wisconsin Department of Natural Resources
Photo: Wisconsin Department of Natural Resources
Photo: Wisconsin Department of Natural Resources
Photo: Wisconsin Department of Natural Resources
Photo: Wisconsin Department of Natural Resources
Photo: Wisconsin Department of Natural Resources
Photo: Wisconsin Department of Natural Resources
Photo: Wisconsin Department of Natural Resources
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