posted on Mar, 3 2008 @ 07:46 PM
NASA doesn't make that claim, specifically. In particular, they will admit that the ice caps grow and retreat as mars travels through its seasons
around the sun.
I think their official guess on this (they don't provide a reason for it) has to do with the avalanche being on the edge of the ice flow. They could
speculate that much like the edge of a glacier is active, the cliffs next to the ice cap are active. At the very least, hundreds of millions of years
of ice growing and retreating would cause erosion. So the planet could never be geologically dead at that level. They could talk about this event in
purely geological and hydrological terms and it would be a valid discussion.
Its possible that the edge of the ice is very active and this kind of event is common.
ArMap, I was lead to believe that the one pole with a permanent cap was largely water ice, with CO2 making up the annual frost outside the polar cap.
Is that wrong? Edit: So I just looked it up and the Mighty Interwebs said they are a mixture of CO2 and H2O. I wonder what mixture that slushy is.
[edit on 3-3-2008 by Ectoterrestrial]