How did the Tonto Natural Bridge form?

bridge form natural tonto
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How did the Tonto Natural Bridge form?

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Tonto Natural Bridge in Arizona is the largest natural travertine bridge in the world, spanning Pine Creek 183 feet high. Mineral springs rich with limestone formed the massive bridge one drop at a time. Hats, shoes, or other items left in the creek become encrusted with travertine and appear to be made of stone.

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