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

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

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 ...

"Yet, even in the deep chill of East Antarctica, the change of seasons causes surface melting far inland from the coastal ice front." 1 of 2 NASA image of blue meltwater pools on the Amery Ice ...