Thursday, August 28, 2014
This undated photo provided by the National Park Service shows rocks that have moved across a dry lake bed in Death Valley National Park in California's Mojave Desert. For years scientists have theorized about how the large rocks, some weighing hundreds of pounds, zigzag across Racetrack Playa leaving long trails etched in the earth. Now two researchers at the Scripps Institution of Oceanography have photographed these "sailing rocks" being blown by light winds across the former lake bed.
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