Las Vegas Sun

July 25, 2016

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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.

National Park Service / AP

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.