Volcanoes like Kilauea and Mauna Loa aren’t erupting like we thought they did, scientists are finding

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Basaltic volcanoes spew extremely flowing lava that travels fast and far. (Image credit: Salvatore Allegra Photography via Getty Images)

Volcanoes that sit within the Earth’s tectonic plates do not erupt as scientists thought they did. It turns out that magma in these volcanoes is driven up and out of the ground by carbon dioxide — not by water, as previously thought, a new study shows.

This magma also shoots up from much deeper reserves than previously estimated, originating in the Earth’s mantle at depths of 12 to 19 miles (20 to 30 kilometers), rather than in the outer crust, 4 to 8 miles (7 to 13 km) depth.

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