FRESH WATER
FRESH WATER. The Great Lakes. Thanks to Michael W. Rowan, Ph.D. for most of this presentation…. Part One. The Great Lakes. Began to form ~500,000 years ago Took present shape ~10,000 years ago Watershed area = 196,000 sq. miles 34 million people (27.5 million U.S., 6.4 million Canada)
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