Journey to Novarupta Speaking Presentation - Part 1
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Journey to Novarupta Speaking Presentation - Part 2
The eruption that formed Novarupta was the largest to occur during the 20th century. It culminated in a series of violent eruptions. Rated a 6 on the Volcanic Explosivity Index, the 60-hour-long eruption expelled 3.1 to 3.6 cubic miles of ash, thirty times as much as the 1980 eruption of Mount St. Helens.