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20171207-usgs-61G Lava Breakout-03

A telephoto view of the small river of lava that formed after the flows' internal pressure fractured the pāhoehoe crust. This river is fed by the evacuation of lava from the molten interior of the flow, which created a cavity beneath the crust (top center). Photo taken Wednesday, December 6, 2017 courtesy of U.S. Geological Survey

A telephoto view of the small river of lava that formed after the flows’ internal pressure fractured the pāhoehoe crust. This river is fed by the evacuation of lava from the molten interior of the flow, which created a cavity beneath the crust (top center). Photo taken Wednesday, December 6, 2017 courtesy of U.S. Geological Survey

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