Scientists say they've discovered a 400-mile chain of extinct and fossilized volcanoes beneath southern China. The volcanoes, the researchers claim, were likely formed when two major tectonic plates ...

Deep beneath central China, geologists have mapped a 400 mile long arc of extinct volcanoes that no longer pierce the surface but still shape the continent from below. The fossil chain, preserved ...

These ghostly hoops have been spotted above volcanic events around the world. But how they form has long been a mystery.