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A USGS team conducts a leveling survey on a volcanic mountain on August 24, 2006. The process involves precise measurements to monitor any changes in the landscape due to seismic activity or geologica...
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A USGS team conducts a leveling survey on a volcan...

A volcanologist collects lava samples at Hawaii Volcanoes National Park, part of the U.S. Geological Survey’s ongoing research into volcanic activity. The park is home to Kilauea, one of the world’s m...
LMY25T03_EN8CM0

A volcanologist collects lava samples at Hawaii Vo...