Creeping stones (3 photos)

Here's a little problem:

In the photo - Death Valley - United States National Park.
As can be seen - this stone has overcome quite impressive distance without any help (next to no human footprints, and indeed any trace, except for traces of the stone)

This is one of the really recorded natural phenomena.
These stones, these have a tendency to change their location, leaving visible traces of their movement.

But how?









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