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You would have thought that erosion over billions of years would show, and the erosion would be obvious, but where is it? There are still pointy sharp rocks, there are no rocks with obvious wind erosion visible, all I see is a small covering of very fine dust.
Sorry to burst your bubble, but Earth has far more erosion than Mars does.
On Earth it comes from wind, water and general wear and tear and this is obvious just looking at the environment on Earth. Mars we dont see many grooves on a small local level evidenced by the rovers on the ground. I have linked to other examples of grooves which cannot immediately be explained away as localised dust-devils or erosion.
Maybe you can tell us what you reckon may have caused these grooves ON MARS. Earth environmental influences have very little comparison to Mars ones because things are so different up there (or so we are told).edit on 25 Feb 2014 by qmantoo because: (no reason given)
QUOTE (Phil Stooke @ Feb 12 2014, 05:40 AM) *
No, settling of blocks! We've seen it many times in the past - check out the rim of Endurance crater 9.5 years ago.
one model to explain the curious 'embossed' racetrack sand patterns might be that, as the resultant fractures fill in with the deflating block material, and the exposed tops are eroded ever lower, the larger pebbles build up along the perimeters of the blocks where they tumbled or rolled off the topography of the block at that time and remain where they came to rest, leaving berms that build up along the fracture edges as deflation processes continue, eventually the berms alongside the fractures are left higher than the middle of the once-blocks since the bulk of the unmovable material has accumulated there due to the original topography, which supports the degree of variability we see in the berms. im wondering how much material has been eroded off the top here to leave what we see?