PETER MATULAVICH / SCIENCE PHOTO LIBRARY PETER MATULAVICH / SCIENCE PHOTO LIBRARY
Waves breaking on the shoreline of the Georgian Bay in Ontario, Canada in winter. The bay is part of Lake Huron, one of North America's five Great Lakes, the largest group of freshwater lakes in the world. The lakes were formed about 10,000 years ago when great ice sheets, two miles thick, retreated following the last ice age.
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