GRAND RAPIDS, Mich. (WOOD) — When people think of volcanoes, they don’t typically think of Michigan. But volcanic activity ...

Here among the towering basalt columns, the visitor stands inside a lava flow. Magma that swelled up from deep in the Earth cooled so gradually that it formed regular octagonal shapes as it shrunk.

This desert landscape east of Bend was buried by a basalt lava flow about 10,000 years ago. As more lava welled up it buckled the cooled lava crust on top into pressure ridges. Then in 5677 BC, the ...