Also on these boards
Even NASA cannot explain it. It’s best to gaze in wonder at the sliding rocks on this dry lake bed in Death Valley National Park. Racetrack Playa is almost completely flat, 2.5 miles from north to south and 1.25 miles from east to west, and covered with cracked mud. The rocks, some weighing hundreds of pounds, slide across the sediment, leaving furrows in their wakes, but no one has actually witnessed it.
This photo shows an aerial shot of some clouds forming what is called a Von Karmen Vortex street. This phenomenon is caused by the separation of different fluids or gasses when passed over a significantly blunt edge. This shot is specifically taken near the Juan Fernandez islands just off the coast of Chile.
These are grains of sand magnified...'Every time I look through my microscope I am fascinated by the complexity and individuality created by a combination of nature and the repeated tumbling of the surf on a beach.' Prof Greenberg, who searches through thousands of tiny rocks with acupuncture needles to find and arrange the most perfect specimens, then uses a painstaking technique to create his images. He has spent five years searching the globe for remarkable sand grains like these to photograph.