Unusual eruptions at world's largest active geyser Yellowstone National Park's Steamboat Geyser has erupted three times in six weeks - an uncommon but not necessarily dangerous development. Can shoot water 300 feet in the air »

Unusual eruptions at world's largest active geyser Yellowstone National Park's Steamboat Geyser has erupted three times in six weeks - an uncommon but not necessarily dangerous development. Can shoot water 300 feet in the air »