In October 1980, five months after the volcano's devastating eruption, the lava dome began building in the crater. The last dome-building eruption came six years later, though steam explosions ...

Scientists were keeping a close eye on the 925-foot-tall dome of hardened lava that has grown inside the crater since the May 18, 1980, eruption that blew the top off the mountain.

MOUNT ST. HELENS, Wash. - New thermal images reveal that parts of the lava dome in Mount St. Helens' crater are piping hot, and scientists are seeing signs that magma continues to rise.

MOUNT ST. HELENS, Wash. (AP) -- The lava dome in Mount St. Helens' crater apparently is growing, possibly a new sign of an impending eruption, but a major explosion doesn't seem likely, a top ...