Stretching more than 500 kilometres and bordered by Wisconsin, Michigan, Illinois and Indiana, Lake Michigan is the only one of the five Great Lakes entirely contained within the United States. The lake frequently appears leisurely to anyone standing at its edge, rippling softly in the breeze with minimal drama beneath. Researchers knew that currents inside large lakes could transport heat, nutrients and pollutants, but offshore dispersion in lakes this large had rarely been measured directly.
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