Surprise blast of rock, water and steam in Yellowstone sends dozens running for safety

A surprise eruption in Yellowstone National Park shot steam, water and dark-colored rock and dirt high into the sky Tuesday and sent sightseers running for safety. A surprise eruption in Yellowstone National Park shot steam, water and dark-colored rock and dirt high into the sky Tuesday and sent sightseers running for safety. Environment Phys.org – latest science and technology news stories