Mexico’s Popocatépetl volcano has long drawn attention for its size, constant activity, and glowing plumes of smoke and ash, ...

Scientists working alongside the U.S. Coast Guard have discovered a 1,640-foot-tall (500 meters) structure that looks like an underwater volcano off the coast of Alaska. The structure may be spewing ...

Mapping in the Chukchi and Beaufort seas off Alaska has uncovered a 1,640-foot-tall structure on the seafloor, but scientists say it's too early to determine the nature of the discovery. When you ...