Volcanoes are rumbling as scientists monitor earthquakes at Washington's Mount Rainier and Alaska's Iliamna volcano.

From towering volcanic peaks to shimmering hypersaline lakes, Mammoth Lakes is a place where adventure and geology come together in the most spectacular way. Beneath its scenic mountains, alpine lakes ...

WASHINGTON — Government scientists have classified 18 U.S. volcanoes as "very high threat" because of what's been happening inside them and how close they are to people. The U.S. Geological Survey has ...