SEATTLE -- The molten rock rising inside Mount St. Helens is giving the peak an eerie red glow at night. Lava has been climbing to the surface at nearly 1,300 degrees for the past few days in a ...

The liquid outer core is surrounded by the thick layer called the mantle. It’s mostly solid rock, not melted like lava. Over time, changes in heat and pressure make the solid rock slowly flow. It’s ...

Are you ready for an explosive adventure across America’s most dynamic landscapes? If you want to witness ...

Add Yahoo as a preferred source to see more of our stories on Google. Don't panic: Mount St. Helens is not erupting. Officials confirmed on Sept. 16 that Mount St. Helens does have ash surrounding it ...

When Mount St. Helens erupted on May 18, 1980, the landscape changed in an instant—the geologic version of an instant, anyway. It was the deadliest eruption the United States had ever seen, leveling ...

The 1980 eruption cycle made Mount St. Helens one of the most famous and now best-monitored volcanoes in the Cascades. But it is far from the only volcano in the range. From southern British Columbia ...

In the shadow of Mount St. Helens’ summit, 20 girls spent a week studying pumice, ash and lava at a GeoGirls camp. The famous Washington volcano served as a base camp for middle and high school girls ...

MOUNT ST. HELENS -- The media crush is thinning, the hordes of tourists are trailing off, and the mountain appears to have settled in for a long, restless bout of growing pains. And although lava ...

"Holy cow, it's incredible," said Racine, who is normally assigned to the Johnston Ridge Observatory on the other side of the volcano. "It's hard to describe." Racine joined a group of rangers, ...