We think the Great Lakes are big. But 12,000 years ago, there was a "Ghost Lake" in the center of North America that was bigger than all of them combined. Glacial Lake Agassiz. It covered parts of Canada, Minnesota, and North Dakota. The Scary Part: It wasn't held back by dirt. It was held back by a wall of ice. When the ice dam finally broke, it didn't just flood the land—it changed the world. The freshwater rushed into the ocean so fast that it stopped the Gulf Stream and triggered a mini Ice
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Minnesota rocks! 🪨🤘 From fascinating potholes to ever-changing cave formations, remnants of ancient glacial activity and tilted rocks formed in bygone oceans, you can see the rich geological history of our state almost everywhere you go. This summer, take a trip to a Minnesota state park near you to unearth the story of the landscape you are standing on: 🪨 Interstate State Park 🪨 Forestville/Mystery Cave State Park 🪨 Blue Mounds State Park 🪨 Glacial Lakes State Park 🪨 Jay Cooke State Park
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