Worldview satellite image collected May 28, 2017, showing the initial development of an ash plume shooting 40,000 feet (12 kilometers) skyward during the 2016-2017 eruption at Bogoslof. This image was captured just after the plume rose above the atmospheric freezing level of water, and 2 minutes before production of detectable lightning. The white color toward the top of the column indicates a large amount of condensed water and ice. This abundant water comes from the ocean under which the vent is submerged. Image provided under a Digital Globe NextView License. Credit: Dave Schneider and the Alaska Volcano Observatory/USGS.
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