"One of the most interesting mysteries of Death Valley National Park is the sliding rocks at Racetrack Playa (a playa is a dry lake bed). These rocks can be found on the floor of the playa with long trails behind them. Somehow these rocks slide across the playa, cutting a furrow in the sediment as they move. No one knows how they move!"
Thanks for the interesting tidbit.
'Be kinder than necessary, for everyone you meet is fighting some kind of battle.' SD FAQ Megathread - Very helpful
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