Here's one for a geologist, it concerns the naturally formed pipe rock. I don't mean some sort of new music, I'm refering to the encircled area of this classic NASA photo.

A Natural Formation?

Please someone explain this formation to me, as I am quite a novice as to how this formation is achieved.

Pipe Stone Then?

I would enjoy any explanation for this type of formation, including the hole in the end. All E-mails will be read and receive a reply.

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