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The Great Lakes are massive remnants from glaciers that
retreated about 11,000 years ago. Critical to weather and climate in
the region is the fact that these glacial jewels were formed halfway
between the equator and the North Pole within a lowland corridor
that extends from the Arctic Ocean to the Gulf of Mexico, allowing
an easy exchange of cold air from the north and balmy air from the
south. When contrasting air masses move into the region, they meet
above massive bodies of fresh water stretching in different
directions through a latitudinal span of over 7.5 degrees, or about
575 miles, and a longitudinal range of 16 degrees, or about 800
miles.
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