Lake Michigan ice balls appear on beach at Holland State Park

The balls, experts say, form on beaches when weather conditions are just right: The temperatures are just below freezing along shallow beaches.

Photo: Massive Ice Balls Along Lake Michigan

Watch Weird Giant Ice Boulders Form on Lake Michigan

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Ice volcanoes' erupt on Michigan beach during Arctic blast

They're back! Ice balls have formed - Holland State Park

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It's so cold in the Midwest that thousands of ice balls have

Ice balls appear on Lake Michigan beach, wash up 'by the thousands