 These thin floating ice panels, frozen during cold winter nights, are driven by light winds and shove rocks at up to 5 m/min (0.3 km/h).Some GPS-measured moves lasted up to 16 minutes, and a number of stones moved more than five times during the existence of the playa pond in the winter of 2013-14.Because rock movement relies on a very rare set of circumstances, namely the usually-dry playa being flooded, and cold conditions to allow the water to freeze, drier winters and warmer winter nights would cause such circumstances to occur less often.