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I have a nice example of boulder tracks (at last!):
Do we know why the boulders move at all?
Good point. Shouldn't have said "rolled" as maybe some roll and some slide down slopes.
Have you read about a place in Nevada where there are rocks that slide on a flat surface? You can see their tracks...I think the ice that forms underneath makes them slippery and that's why they glide.Maybe the Moon dust works like that too...