grand canyon national park under cloudy sky |
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| navigate by keyword : badlands geology canyon formation wadi terrain rock plateau cliff valley landscape wilderness mountain butte soil hill grand national park cloudy sky earth 39aph39 geological history colorado river tributaries channels layer uplifted ancestral puebloans native american culture present day four corners united states cultural archaeology anasazi puebloan peoples navajo red gorge gully ravine glen gulch coulee reservation |
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| Nearly two billion years of Earth's geological history have been exposed as the Colorado River and its tributaries cut their channels through layer after layer of rock while the Colorado Plateau was uplifted. |
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