The Great Lakes (from left: Lake Superior, Lake Michigan, Lake Huron, Lake Erie, and Lake Ontario) contain about 21% of the world's freshwater.

Photograph courtesy NASA

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North America: Physical Geography
North America: Physical Geography Encyclopedic Entry

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6 - 12 and up

Earth Science, Geography

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Encyclopedic entry. North America, the third-largest continent, extends from the tiny Aleutian Islands in the northwest to the Isthmus of Panama in the south.