Before we dive into what would happen, supervolcanos are basically characterized as volcanic centers that have had eruptions covering more than 240 cubic miles, and in the US, there are two: Yellowstone and Long Valley, California. In the past 2.1-million-years, Yellowstone has had three major events, which subsequently led to the creation of the calderas, or large volcanic craters. Read more for a video and additional information.
The last eruption occurred around 174,000 years ago, and it led to the West Thumb Geyser Basin, which extended the Yellowstone Lake. When could it erupt again? Researchers at the US Geological Survey claim the odds of it erupting within a given year are one in 730,000. If one were to happen, the eruption could emit ash that would expand over 500 miles, along with toxic gasses, including sulfur dioxide, which can lead to acid rain as well as global cooling as it reflects the sun away from the Earth.
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