Hi everyone, you might enjoy this 11-minute, mapping-oriented video

 

https://www.youtube.com/watch?v=_uelSDhEKLo

 

Sincerely, Harvey

 

Harvey Thorleifson Ph.D., P.Geo., D.Sc., Director, Minnesota Geological
Survey; State Geologist of Minnesota; Professor, Department of Earth
Sciences; College of Science and Engineering; University of Minnesota; 2609
West Territorial Road, St Paul MN 55114-1009 USA; Telephone 612-626-2150;
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