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    • CommentAuthorJay Kangel
    • CommentTimeNov 18th 2012
    I answered the question with the observation that there are many natural arches on the surface of the Earth together with a link to a Google search for natural arches. This answer has been deleted. What is the reason for this deletion?
    It was flagged as spam because it had absolutely no mathematical content.

    Your answer did not have much of anything to do with the question.