Minnesota

Volcanic history

Minnesota Volcanic Explosions

Monday, Oct. 28th 2013 at 9pm

Minnesota St

St Paul, MN

History

Rocks can tell us a lot about what happened in Minnesota long ago. They show a history of volcanoes, seas, mountain ranges, earthquakes, and glaciers. Volcanic action creates lava and ash. The rocks along Minnesota's North Shore of Lake Superior, for example, were created from cooling lava. Bentonite clay in southeastern Minnesota was formed from volcanic ash.