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Description: Located at the corner of Wyoming, Montana and Idaho, Yellowstone, America's first National Park, sits on one of the most powerful supervolcanoes on the planet. Yellowstone Caldera last erupted approximately 64 million years ago, sending pyroclastic flows across hundreds of miles in diameter, and covering most of North America with a thick layer of ash. Carried by weather, ash and other particles covered the globe, causing a year-long blackout, and resulting in a devastating nuclear winter.nnToda