Natural Bridges are formed when streams erode away soft rock that exists underneath resistant rock layers.

The major difference between a natural bridge and a natural arch is the way that each is formed. A natural bridge is the result of running water that creates a valley beneath hard, resistant rock. A natural arch is created when wind, ice, and water creates a hole through a thin wall or fin of rock. Water is a factor in both processes. The difference is that water simply speeds up the process of creating arches, while it is entirely responsible for creating bridges.

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