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.
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Because of their sea-like characteristics, such as rolling waves, sustained winds, strong currents, great depths, and distant horizons, the five Great Lakes have long been called inland seas.
The story of the Great Lakes began over 1 billion years ago, when the ancient supercontinent Laurentia began splitting in half. Over the course of about 10 million years, the Midcontinent Rift System opened a massive fissure on its way to becoming a new ocean basin.
A north-northeast wind has pushed the warmer surface water along the Michigan shore back toward the middle of Lake Michigan and brought up colder water from well beneath the surface. This process is called upwelling.
There is an abundance of life and different creatures you might find in Lake Michigan. Whales just aren't one of them. See all of the animals you can find in the lake here.