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The death of volcanologist David Johnstone during the erup.on of Mt. St. Helens in 1980 is mostly due to: A. An unexpectedly large lahar caused by mel.ng of the snow on Mt. St. Helens B. The lack of any indica.on that an erup.on was imminent C. A largely unexpected lateral blast during the erup.on D. His disregard for an order to evacuate prior to the erup.on

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