A dangerous climb is renewing the focus on Mount Rainier's extreme hazards.

New seismic imaging shows magma lingering beneath quiet Cascade volcanoes, shaping how scientists monitor and plan for eruptions.

Washington state may not have to worry about hurricanes, but it is volcano country. The United States has 161 active volcanoes – all in the western U.S. – but only 18 are classified as a "very high ...