Grand Canyon: Top Photos

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

This sequence is made up of three clips that are close-ups of Colorado River rapids. 1) 30 seconds of churning whitewater waves. 2) 30 seconds of a wave train that forms, changes, then reforms. 3) 30
This sequence is made up of three clips that are close-ups of Colorado River rapids. 1) 30 seconds of churning whitewater waves. 2) 30 seconds of a wave train that forms, changes, then reforms. 3) 30… © Grand Canyon NPS, Public domain, via Wikimedia Commons

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