Discovery of ancient super-eruptions indicates the Yellowstone hotspot may be waning

Throughout Earth's long history, volcanic super-eruptions have been some of the most extreme events ever to affect our planet's rugged surface. Surprisingly, even though these explosions eject enormous volumes of material -- at least 1,000 times more than the 1980 eruption of Mount St. Helens -- and have the potential to alter the planet's climate, relatively few have been documented in the geologic record.

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