For reasons that are not clear, the huge volcano under Yellowstone National Park has been rising at an unprecedented rate during the past several years. But that doesn't necessarily mean that a massive, doomsday eruption is about to happen, finds a study that manages to put everyone at ease, more or less.
Mt. St. Helens erupted 30 years ago. With an Icelandic volcano causing global problems today, the Mt. St. Helens anniversary is a reminder of volcanic activity in America's Lower 48 states.