Though it's a rare occurrence, there is a simple explanation for the giant ice boulders. Enormous sheets of ice form over Lake Michigan in winter. Chunks of the ice break off, growing layer by layer. As the growing chunks are tossed by waves they eventually form smooth, rounded balls which then wash up along the shores.
To find out more:
http://www.dailymail.co.uk/news/article-2285997/Hundreds-giant-ice-boulders-weighing-75-POUNDS-wash-ashore-Michigan-beach.html
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