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Geology

Bridges form through the erosion of rock by streams or rivers. This window or arch formed from a combination of processes. Frost wedging, the expanding of cracks in rock as water turns to ice, weakened the rock. Dissolution, the chemical dissolving of rock by rainwater, chewed away at the top and sides of this wall of rock. Finally gravity pulled loose the weakened pockets of rock at the center creating the hole you see. Thus, Bryce Canyon's 'bridges', including Natural Bridge, are spectacular examples of arches that, like the hoodoos, are constantly at risk of destruction as the forces of erosion continue to wear the rock away.

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