The Great Lakes were formed when the glaciers cut through the surface of the earth and melted. This created the largest source of fresh water on the face of the planet.
Even though Lake Michigan is the largest lake in the United States it is only the 3rd largest of the Great Lakes and the 5th largest lake in the world. Lake Michigan is 923 feet deep at its deepest point and 307 miles long and 118 miles wide at its widest point. It is the only Great Lake to lie completely within the boundaries of the United Sates.
Lake Michigan contains so much water that more than 320,000 gallons evaporate off of the Lake every second!
Lake Michigan is so big that more than 400,000 gallons of rain or snow land on the Lake every second!
