Sandstone Arch or also known as Natural Arch is a natural rock formation where a rock arch forms, with an opening underneath. Most natural arches from as a narrow bridge, walled by cliffs, become narrower from erosion, with a softer rock stratum under the cliff-forming stratum gradually eroding out until the rock shelters thus formed meet underneath the ridge, thus forming the arch. Natural arches commonly form where cliffs are subject to erosion from the sea, rivers or weathering; the processes "find" weakness in rocks and work on them, making them larger until they break down.
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