@CNN: People in northern Michigan are getting to enjoy a phenomenon normally only seen in glaciers: blue ice, piled up in the Straits of Mackinac https://t.co/auNu6XkAzH https://t.co/EjbevxHZSV

@CNN: People in northern Michigan are getting to enjoy a phenomenon normally only seen in glaciers: blue ice, piled up in the Straits of Mackinac https://t.co/auNu6XkAzH https://t.co/EjbevxHZSV