Ice volcanoes erupt on a Lake Michigan beach.

A cold front brought some interesting phenomena to Lake Michigan: first ice balls, now ice volcanoes.

National Weather Service meteorologist Ernie Ostuno captured some amazing photos of erupting ice volcanoes Sunday at Oval Beach in Saugatuck, Michigan.

An ice volcano is a cone-shaped mound of ice formed over a lake by the eruption of water and slush through an ice shelf.

"Ice volcanoes occur in locations in which waves hit accumulated ice on the shoreline with some force," said Cort Spholten, a meteorologist with the National Weather Service of Grand Rapids.

The ice volcanoes formed after another rare phenomenon on Lake Michigan.

Friday, thousands of ice balls rolled up onto the lakeshore. According to experts, the weather conditions have to be just right: The temperatures are just below freezing along shallow beaches. Slush collects into round shapes, and the waves sculpt ice chunks into orbs.

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