It’s hard not to be awed by an active volcano. Molten rock—magma—making its way to the surface gives us a glimpse of the powerful forces that made Earth and continue to shape it today. The national parks protect these active processes and the volcanic features left behind from past activity. Watch these forces at work. Walk on ancient lava beds. Climb to the peaks of long-dormant craters. Learn more about volcanoes. All in your national parks.