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Death Vally National Park,playa,rocks,moving rocks               	, photo
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Race Track Playa

Death Valley NP, CA

These are the famous moving rocks of Race Track Playa in Death Valley National park. The current scientific theory about how  and why they move centers around friction being reduced by ice "rafts" enclosing the rocks with Winter winds pushing them across the clay rich playa surface. The ice-water-sediment interface creates a very low friction positive pressure which allows  the rocks to slide very easily across the playa.