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Hawai'i Volcanoes National ParkLava flows like a river out of a hardened crust.
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Hawai'i Volcanoes National Park
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Skylight reveals lava flowing to the ocean.  

Did You Know?
Large volumes of lava move in lava tubes beneath the hardened surface of recent flows. Skylights form when the roof of a lava tube collapses, revealing the molten lava flowing like a river within the tube.

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Last Updated: February 01, 2008 at 13:37 EST