Long trails showing rocks’ movement make phenomenon all the stranger.
Unforgiving sun, punishingly hot days, freezing nights, no water, and a name like Death Valley keep people away from this ultra-dry section of California. Those who do venture there notice that sometimes, in some places, rocks just move. They don’t do it a lot, and they never do it when anyone is watching. Make no mistake, though, they do it. They leave behind long, even grooves in the packed dust to prove it.