Rocks On Walks Poem by Ima Ryma

In Death Valley for centuries
Large rocks have moved along the ground.
One of the local mysteries -
How can these rocks be motion bound?
The rocks leave pathways in the sand
With no other markings nearby.
Humans do seek to understand
How can these large rocks move and why?
There are a lot of theories of
What might be making these rocks go.
Perhaps it's UFOs above.
Perhaps it's due to ice below.

Whatever forces do propel
These rocks is yet a truth to tell.