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reply to post by boncho
Boncho brother, take no offence please, your post may very well be ODD (obsessive debunking disorder).
Careful Gortex, ODD might be contagious!
But why does NASA not point this out straight away and avoid all the speculation?
Don't know if it's a root, in Australia there is a place known as 'The Pinnacles', which is a desert of rocks that have been eroded due to the wind rubbing sand against the rocks.
Also you can say on earth that it is impossible (or extremely unlikely) for that indent on the rock to appear on earth, but this isn't earth, the weather is more extreme and the temperatures (that could possibly cause rock to fracture) is more extreme.