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No one knows but my theory is that either strong gales or a strange magnetic/ gravitational pull is moving them.
on August 01, 2014
They get picked up by glaciers, scrape the ground when the glaciers move, and get deposited when the glaciers melt.
on June 04, 2015
I think that, since Death Valley is on/close to a fault line, the rocks are magnetized to the tectonic plates (not the ground shell; maybe the top layer doesn't move with the tectonic plates because it's so hard??) and they move with the plates. ?? Idk XD
on April 07, 2015