posted on Jun, 11 2004 @ 06:41 PM
Having worked a lot of powders in the lab, that is no where out of the ordinary for a fine grain formation.
Fine sand or metal powder often act like a fluid, so much so that powdered graphite is used as a lubricant in many machines.
I would say there is an equal chance that it is water except for two major things.
1) Those images are take over several minutes and done in mosaic, if those were waves caused by wind they wouldn't look like waves they would be
streched out blurs.
2) In a crater that size the water's depth and wind speed wouldn't make waves that large.
My best guess would be sand dunes, though I assume volanic rock could end up like that as well. Also the possibility of water can't be ruled out, but
take not of the two above listed resons i doubt it.