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What's Under Yellowstone?
What's Under Yellowstone?
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ash volume
Pictures: USGS |

Volcanic eruptions are ranked on a scale ranging from 1 to 8 called the Volcanic Explosivity Index, or VEI. As the relative size of the circles representing the volume of ash and ejecta show, the last major Yellowstone Caldera eruption, more than 600,000 years ago, dwarfs that of "typical" volcanoes, like Mount St Helens.


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Pictures: USGS |

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