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Glacial debris

A giant boulder left from Ice Age floods still sits along Highway 172 near the town of Mansfield, a few miles from Steamboat Rock. (Steve Ringman / The Seattle Times)

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Filename: Glacial debris
Copyright: The Seattle Times
Image Size: 3192x1875 / 1.1MB; Climate Eastern Washington Ice Age floods glacial lakes ice plugs water silt debris

A giant boulder left from Ice Age floods still sits along Highway 172 near the town of Mansfield, a few miles from Steamboat Rock. (Steve Ringman / The Seattle Times)