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Nature’s Subway System: The Lava Tubes of Hawaii’s Big Island

October 9, 2014

Pu'u O'o volcanoLike the subways of New York City that burrow their way through a maze of underground tunnels, Hawaii’s lava tubes stretch for miles just below the earth’s surface. They are formed when basalt lava creates a crust on the visible landscape while the hot liquid continues to flow just underneath. This underground plumbing system insulate the lava and allows it to flow for miles without ever cooling.