Death Valley's Sailing Stones
Rock trail of one GPS-equipped rock.
Source: Figure 4, Sliding Rocks on Racetrack Playa, Death Valley National Park: First Observation of Rocks in Motion. Image by Mike Hartmann. doi:10.1371/journal.pone.0105948.g001

Rock trail of one GPS-equipped rock.

Source: Figure 4, Sliding Rocks on Racetrack Playa, Death Valley National Park: First Observation of Rocks in Motion. Image by Mike Hartmann. doi:10.1371/journal.pone.0105948.g001