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Lisa Morgan, Research Scientist with USGS, delivering talk on Yellowstone Lake Bulges and topography, and thermal acitivity that may indicate the presence of the magma pool that creates the huge volcano eruptions every 600,000 years. This talk was part of the Draper Museum Lunchtime Expedition Series. She explains the discovery of a large buldge found near Mary Bay, and shows images of the bottom of the Lake

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