592409 external_news 1496672145 1496677499 There are two supervolcanos within the U.S., the most famous one underneath Yellowstone National Park. If any of these erupt, all that ash and dust in the atmosphere could be catastrophic for Earth's climate. Fortunately, supervolcano eruptions are few and far between, which is why scientists are trying to learn as much as they can now about why they're so rare.  A new study published in Nature Geoscience by a team including School of Earth and Atmospheric Sciences professor Josef Dufek theorizes that supervolcanos rely on very deep magma reservoirs that can take millions of years to form. 

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