Sixty miles beneath the birch-speckled forests of southern New Hampshire, the rocks are hotter than they should be—much hotter. First discovered in the 1970s, the heat anomaly was thought to be the remnants of an ancient hotspot in the Earth’s mantle. Instead, new seismic measurements suggest it’s an area of active upwelling. And that has led geologists to an astonishing conclusion.
Source: Gizmodo – New Hampshire Might Have Volcanoes One Day