Roughly 124 miles (200 kilometers) beneath the Appalachian Mountains in New England lies the aptly named Northern Appalachian Anomaly (NAA), a mysterious 218-mile-wide (350-km) region of unusually hot rock. Researchers have long believed that the NAA resulted from the plate tectonic movement that broke North America off northwest Africa 180 million years ago. In a new study published Tuesday in …
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