The carving of a rock arch from a freestanding fin, wall or headland of rock as weathering and erosion exploit a line of weakness and slowly pierce a hole through it. Away from the coast the process is usually driven by frost wedging, chemical weathering and the collapse of weaker rock beneath a more resistant caprock, producing landmark spans such as those of Utah's Arches National Park.
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Timescale (category) Process Type Natural Arch Formation
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1. Natural arch (Wikipedia)
Wikipedia infobox 'Lead section' = 'A natural arch, natural bridge, or (less commonly) rock arch is a n...' on 'Natural arch'View the Source 2. Natural Arch Formation (Wikipedia)
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A natural arch, natural bridge, or rock arch is a natural landform where an arch has formed with an opening underneath. Natural arches commonly form where inland cliffs, coastal cliffs, fins or stacks are subject to erosion from the sea, rivers or weathering.
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