God's handiwork
Falling rocks, then natural weather.
key word... natural....
The natural process of weathering formed the arch over millions of years.
Slightly acidic rain and ground water along with wind gradually wore away the underlying rock that is high in limestone content.
It's really cool. If you get a chance to go, do it. Also, stop at the Kentucky Reptile Zoo.
Natural Bridge is composed of what is known in geological terms as Pottsville conglomeratic sandstone. Large blocks of stone falling off either side of a narrow sandstone ridge caused the first opening that began the transformation of the sandstone outcropping into an archway. The weathering process, along with the root systems of plants, continued to develop the unique archway that makes up Natural Bridge. Taken from: parks.ky.gov/parks/resortparks/natural-bridge/history.aspx
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