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The descent of the devil - the unusual mountain in the US
In Utah, the United States, there is an unusual mountain, which is called the Descent of the Devil. Mountain consists of two parallel "walls" height of 12 - 14 meters, forming something like a corridor 60 meters long. "The walls" consist of hard limestone shale, and between them is a soft limestone, which is periodically washed out by precipitation. Several million years were needed to ensure that rainfall made this natural corridor and provided a form of grief.
