The Great Lakes formed where they did 20,000 years ago thanks to a hotspot that sat under the supercontinent Pangaea 300 million years ago, before North America even existed. New research finds ...

Prior research has shown that the Great Lakes were formed by ice movement during the last Ice Age—as the ice melted, it filled the lakes with water. In this new study, the researchers found ...

The Great Lakes comprise ... "There are many big lakes and also there are many hotspots," Li confirmed. "Connecting those lake regions to ancient hotspots might reveal the way these mantle ...

Shipments of iron ore on the Great Lakes totaled 4.6 million tons in December, a decrease of 4.5 percent compared to a year ago. Shipments were just slightly above the 5-year average for the month.