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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...
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A volcanologist collects lava samples at Hawaii Vo...

The Pinatubo 91 ash deposits, dated June 26, 1991, are remnants of the eruption of Mount Pinatubo, one of the largest volcanic eruptions of the 20th century. The ash deposits are an important geologic...
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The Pinatubo 91 ash deposits, dated June 26, 1991,...

April 11, 2018 - Washington, District of Columbia, United States of America - Mark Zuckerberg, Co-Founder and CEO of Facebook, testifies before a meeting of the United States House Committee on Energy...
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April 11, 2018 - Washington, District of Columbia,...