banzhuanjushi 2008-1-21 20:37
国家地理每日一图（2008.01.21）
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[color=YellowGreen][size=4]A time-lapse image blurs the silty, mocha-colored waters of the Colorado River as it flows through sheer cliffs in Grand Canyon National Park. The now tame Colorado carved these steep walls over the last six million years, exposing rock strata that detail nearly two billion years of North America’s geologic history.
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