Last week, an eruption from the Black Diamond Pool in Yellowstone National Park shot up about 20 feet, according to the Yellowstone Volcano Observatory.

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A "sharp, volatile-rich cap” about 2.5 miles under Yellowstone’s surface “acts like a lid,” trapping pressure and heat that it releases gradually.

A seismic survey reveals a magma cap 2.5 miles under Yellowstone, acting as a pressure-release lid and reducing the risk of a super volcano eruption.

A seismic survey reveals a magma cap 2.5 miles under Yellowstone, acting as a pressure-release lid and reducing the risk of a super volcano eruption.