GRAND RAPIDS, Mich. (WOOD) — When people think of volcanoes, they don’t typically think of Michigan. But volcanic activity was the driving force behind some of Michigan’s key resources and landmarks.

MUNISING, MI - It’s a winter scene unique to this part of Northern Michigan: water plunges over a nearly 50-foot sandstone cliff into a circular vortex, in the shape of an ice volcano. This was the ...