At ground level, Hicks Dome looks like one of the many other bluffs in southern Illinois, but under the surface, it's a dormant volcano with unusual minerals and elements. The 21st was joined by a geologist that's been studying the dome.

At ground level, Hicks Dome looks like one of the many other bluffs in southern Illinois, but under the surface it's a dormant volcano with unusual minerals and elements. The 21st was joined by a geologist that's been studying the dome.