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 behind the ...
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 behind the planet’s ...
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 that ...
After nearly a week of freezing temperatures — below zero on several days — the Great Lakes are seeing significant ice creation, with Lake Erie nearly completely frozen over. Lake Erie was about 80% ...
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