Megavolcanos on Planet Earth

There are at least four mega or supervolcanos on Earth. When they erupt most, if not all, plant and animal life on our planet is wiped out. The largest of these megavolcanos is under Yellowstone National Park. It has a 600,000 year cycle. That is, it erupts every 600,000 years. It has been 640,000 years since its last eruption.

Nova, TPT Channel 2, 26.9.2006

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