Fry, however, would not call the Great Lakes inland seas—at least not scientifically. Despite their size, the lakes are beholden to what happens on the land that surrounds them in a way larger seas are not.
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Because they're fresh water. Because they're not seas. First of all lakes are vastly smaller than seas, some which are large enough to encompass or surround larges bodies of land. Also lakes are freshwater.
Such small lakes are often referred to as ponds. Other lakes are so big that they are called seas. The Caspian Sea, in Europe and Asia, is the world's largest lake, with an area of more than 370,000 square kilometers (143,000 square miles).
Chicago's entire 28-mile Lake Michigan shoreline is man-made. The original sand dune and swale topography has been dramatically altered. Before American settlement, storms changed the shoreline, either by building up or eroding sand.
Not only is this lake massive - spanning 307 miles in either direction - but its shores also run parallel, causing unique wave shapes. The shapes of these waves are what contribute to rip tides, which are one of the most dangerous things swimmers can encounter in the water.
The blue in Lake Michigan and Lake Huron is sediment brought to the surface when strong winds churned the lakes. The green in Lake Erie and in Lake Huron's Saginaw Bay is algae, which builds on the surface when winds are calm.
The lake's formation began 1.2 billion years ago when two tectonic plates moving in opposite directions left a giant scar—an event now known as the Midcontinent Rift. Less than 15,000 years ago, melting glaciers filled the giant basin, and Lake Michigan came to be. The lake's maximum depth is 925 feet.
Scientists might not classify the big lakes as seas, but they often study them as if they were. “The modelers here who work on things like currents and waves and ice use ocean models,” says Lauren Fry, a principal investigator at NOAA's Great Lakes Environmental Research Laboratory (GLERL) in Ann Arbor, Michigan.
Dreyer is the only person who has swum the width of Lake Michigan between Wisconsin and Michigan, having swum from Two Rivers, Wisconsin, to Ludington, Michigan, in 1998. In the 2023 swim, he was attempting to beat his own record by swimming 25 miles further in the route from Milwaukee to Grand Haven.
Europeans derived Lake Michigan's name from the Anishinaabemowin word mishigami, meaning “big lake.” It is the second largest Great Lake by volume and third by area surface; it is the only one located entirely within the United States.