Each spring on Lake Michigan, if you’re lucky, you’ll be able to see shipwrecks due to the incredibly clear springtime waters. Every winter, ice forms on the Great Lakes. That ice is often thick enough that the people who live on their shores can not only go ice fishing, but even ride snow mobiles across their surfaces. At the coming of spring, the ice melts, leaving the waters of some of the lakes especially clear for a while until warmer weather creates algae blooms and other events that reduce the water’s clarity. In the early spring, the waters of Lake...