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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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`a`a flowing over an older flow of pahoehoe.  

Did You Know?
The two types of Hawaiian lava differ in appearance but are chemically alike. Pahoehoe has a smoother and ropey surface where `a`a is jagged and clinkery.

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Last Updated: September 15, 2006 at 10:58 EST