Twelve Enormous Volcanic Eruptions Mark Path Of Destruction From Idaho To Yellowstone

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The violent past has left the western U.S. with plenty of scars. KalypsoWorldPhotography/Shutterstock

The Cassia Hills are a relatively quiet part of the state of Idaho today, but once upon a time the region was home to a series of cataclysmic volcanic eruptions. Over the course of several million years, they burned a track towards the infamous Yellowstone supervolcano up in Wyoming, like a fuse leading to a rather considerable-sized bomb.