In January 1990 a span of London Bridge collapsed, so its name was changed to London Arch. The arch is a tourist attraction along the Great Ocean Road near Port Campbell in Victoria, Australia. Before the collapse, visitors were able to walk from the mainland across the double-span natural bridge. Oceanic erosion of the limestone coastal cliffs caused the formation of the bridge and also caused its collapse to form an arch. Eventually arches collapse to form stacks like The Twelve Apostles, which are icons of the Australian landscape in the vicinity of London Arch (Appendix A).
In this post we will see that rock coastlines are eroding faster than we think. (more…)