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Image description: A geologist dips a rock hammer into an active lava pool at the Hawaiian Volcano Observatory. After scooping out the lava it is placed in the water to quench it. HVO routinely collects lava samples for chemical analysis, which can give insight into changes in the magmatic system. 
Photo from the U.S. Geologic Survey

Image description: A geologist dips a rock hammer into an active lava pool at the Hawaiian Volcano Observatory. After scooping out the lava it is placed in the water to quench it. HVO routinely collects lava samples for chemical analysis, which can give insight into changes in the magmatic system. 


Photo from the U.S. Geologic Survey