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Originally Posted by [1ponders]
Don't know sole, but I'll have a guess. Maybe because it runs generally east west and is so wide the wind storms, that move in that direction ( or is it west east I can never remember) are able to get right down into the canyon lifting the dust high in the asmosphere.
Good question though. I don't know if I'm close but it makes sense to me.
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Yep, that is somewhere near my conclusion. Obviously although there is less atmospheric density the Martian winds pack some punch as even the crater floors seem relatively dust free.
Sole
