Rusty Garrett here with the weekend outlook: An isolated shower or thunderstorm remains possible in the hot and humid air this Saturday, the 4th. Same for Sunday...although NOT a wash-out either day!
DEATH VALLEY NATIONAL PARK, Calif. (August 28, 2014) For years scientists have theorized about how large rocks, some weighing hundreds of pounds, zigzag across Racetrack Playa in Death Valley National Park, 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.
Cousins Richard Norris and James Norris say the movement is made possible when ice sheets that form after rare overnight rains melt in the rising sun, making the hard ground muddy and slick.
The phenomenon doesn't happen often because it rarely rains in the notoriously dry desert valley.
Their report says the rocks move very slowly at a speed of only about 15 feet per minute.
The findings were published Wednesday in the online journal PLOS ONE.