Probably too soon to tell, Debbie, although anything is possible. The earthly arches are formed by a combination of wind and water erosion on material of inhomogenous composition. Much would depend on the composition of Martian rock, the density and wind activity of early Mars, and the length of time that large quantities of water were present. Personally, I think it is possible, but we won't know for sure until we can explore the greater Mars. I think there are all kinds of weird rock formations there. Could make Bryce Canyon look like those "mineral gardens" we made as kids! BTW, arches have been suspected on the moon before, from earthly observations in the pre-space age, only to be discounted once space probes actually got close enough to take detailed photos. But of course the moon never had any wind or water erosion. Real geologists on the list can explain the arch-forming process much better than I. --- UTAHDEB@aol.com wrote:

I posted a picture of Rainbow Bridge in my folder. I've been thinking about how this formed and want to ask a question to the group. Could this happen on Mars? I don't know much about geology but wondered if erosion on Mars could do something similar.

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