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Geologists Just Discovered a Source of Volcanoes Deeper Than Ever Before

Researchers have pinpointed a previously unknown source of volcanoes in the extreme depths of Earth - in the transition zone between the upper and lower mantle.
Until now, we thought we had a handle on the ways in which volcanoes form, welling up from the molten regions in the upper mantle beneath our planet's crust, but the new discovery takes things much farther down.

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