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During their field work, HVO geologists collect lava samples along the fissure 8 channel to learn more about the inner workings of the eruption. This sample is a lightweight, frothy basaltic pumice, called reticulite, which is produced by lava fountains. Photo taken Wednesday, August 29, 2018 courtesy of U.S. Geological Survey

During their field work, HVO geologists collect lava samples along the fissure 8 channel to learn more about the inner workings of the eruption. This sample is a lightweight, frothy basaltic pumice, called reticulite, which is produced by lava fountains. Photo taken Wednesday, August 29, 2018 courtesy of U.S. Geological Survey

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