The mysterious moving rocks of death Vally national park, California have puzzled scientist since the 1940s. Rocks weighing up to several hundreds of kilograms have been known to travel as far as 458 meters over the dry clay bed. Studies have shown that neither gravity nor earthquakes are responsible for the phenomenon. Some scientists believe that a combination of strong winds and surface ice account for these movements. However, this theory dose not explain the evidence of tracks left behind by rock, which start side by side and move in different directions. Moreover, wind speeds of hundreds of kilometets would be needed to move some of the stones. The rock in motion. And no one has come up with a good explanation. Perhaps this story will remain more interesting if the real answer is never discovered.