Grand Canyon: Top Photos

Two billion years of Earth's history cut open by a river

(See file name). (Photo: "Unkar Creek Delta, on Colorado River, near the start of the basement rocks in Grand Canyon." (the start is just upstream) The horizontal cliff at top of the 15 degree, angula
(See file name). (Photo: "Unkar Creek Delta, on Colorado River, near the start of the basement rocks in Grand Canyon." (the start is just upstream) The horizontal cliff at top of the 15 degree,… © National Park Service, Public domain, via Wikimedia Commons

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