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There may also be inorganic weathering of rocks. As Evan mentioned, glaciers, snow, and ice may be a significant component of inorganic weathering. However, there is also rain, wind, and the sea. I've also encountered a type of rock that tends to be fairly solid when hydrated, but crumbles once it is exposed to air and dries out. Volcanic Ash is also a type of fines that could support life.The moon may be different from Earth, but it is covered in a layer of fine dust created by inorganic processes.