As cool as moon rocks are, on Earth rocks can walk. Or at least slide. In Death Valley rocks weighing hundreds of pounds slide across the desert floor leaving trails in their wake. Scientists believe wind and ice are the culprits.

As cool as moon rocks are, on Earth rocks can walk. Or at least slide. In Death Valley rocks weighing hundreds of pounds slide across the desert floor leaving trails in their wake. Scientists believe wind and ice are the culprits.

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