CHICAGO — As an ice sheet thousands of feet thick began its final crawling retreat from North America to the Arctic toward the end of the last glacial period some 10,000 years ago, it left ...

Cape Verde hotspot’s impact on the Great Lakes formation The scientists who led the new research found seismic anomalies in the area of the Great Lakes, known as radial anisotropy.

Great Lakes basins may have formed millions of years ago from activity deep in the Earth — long before glaciers, study finds ...