The snowcapped peak of Mount Rainier, which towers 4.3 kilometers (2.7 miles) above sea level in Washington state, has not produced a significant volcanic eruption in the past 1,000 years.

One of the world’s oldest national parks, Mount Rainier became part of the federal ... one of the world’s most active volcanoes. The Sicily, Italy, volcano is almost constantly in a state ...

It shows the underground plumbing system that provides molten and partly molten rock to the magma chamber beneath the Mount Rainier volcano in Washington state. The scale at left is miles depth.