We can see round rocks in gusev crater, how could they have formed without water being present?
It turns out that you don’t have to have flowing liquid water to form round rocks. There is a geologic process called “spheroidal weathering” that operates on certain kinds of rock. If you take a rock cube and expose it to weather (even just traces of water vapor like those found in the martian atmosphere), the sharp corners and edges tend to get crumbly and flake off faster than the faces. This makes the rocks get more and more round with time.
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