Michigan's lakes sometimes freeze slowly and allow blue ice to form. Here's what to know about the phenomenon.

And, of course, the glaciers and their accompanying deep blue ice cover the south coast. You can run around, climbing on an infinite variety of sculpted ice forms, or you can seize the moment to ...

"The change of seasons causes surface melting far inland from the coastal ice front," glaciologist Christopher Shuman said.

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. An international ...