Minnesota, Earth

Why so many lakes?

Why the Cliffs and Rocks of the North Shore?

Why the iron and metals underground?

Elements of our Geology

• Glaciers
• Ancient Volcanoes
• Great Lakes
• Precious Metals

Glaciers

Glaciers of MN:

• Quaternary Period (2 million years ago)
• Present seasonal cycles first began
• Glaciers advanced / retreated

Ice Age

• Glaciations, were huge sheets of ice
• Covered whole states or more

Glaciers are:

• Slow moving
• Snow accumulates over a long time
• Slides on a "sole" of melt

Erosion

• Glaciers tear up the surface
• Carry rocks and debris
• Deposit further away

BWCA

• Glaciers cause striations and grooves in the surface rock.

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