The moving rocks (also known as sailing stones, sliding rocks) are a geological phenomenon where rocks move in long tracks along a smooth valley floor without human or animal intervention.
They have been recorded and studied in Death Valley, Racetrack_Playa.
Racetrack stones only move every two or three years and most tracks develop over three or four years. Stones with rough bottoms leave straight striated tracks while those with smooth bottoms wander. Stones sometimes turn over, exposing another edge to the ground and leaving a different track in the stone's wake.
Speed is an unknown variable. Since these stones are rarely transported and nobody has witnessed the movement, the speeds at which the rocks travel are not known.
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