|  |  | Mystery: Huge Death Valley Rocks Slide/Move On Own geology.com — Scientists baffled by rocks (some 100s of pounds) apparently moving, sliding on own across "almost perfectly flat" & dry desert area called, Racetrack Playa. No one has seen movement but long visible trails left behind. Number of theories, based on unique nature of desert surface, wind, etc. [Piece includes photos.]More... (General Sciences) Comments Email Added 2008-01-16 13:00:10 openthink