Minnesota River Valley's 3.6-billion-year-old rocks
9:50 AM, December 13, 2012
Audio
- Minnesota River Valley's 3.6-billion-year-old rocks (program audio)
In The Daily Circuit's letters segment this week, a professor mentioned that the Minnesota River Valley is home to 3.6-billion-year-old rocks, some of the oldest rocks on earth. We follow up on why that would be and what they signify about Minnesota's past and future.
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The Daily Circuit from December 13, 2012
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