| http://www.w3.org/ns/prov#value | - Looking at that picture, the wheel tracks appear to have sharp, well-defined edges, which would suggest that Martian sand (at least around where Curiosity is) is more like lunar regolith than sand here on Earth; that is, not smoothed and rounded via weathering, which would mean that it has never been in contact with water or other liquid for a long period. (Although I would think wind and dust storms,
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