Natural Arches

Natural arches – also known as natural bridges – are formed when relatively soft rock is worn away by the action of tides, rivers or weather erosion, leaving behind a bridge-like structure of harder rock. Although there are thousands around the world, most are in remote areas unlikely ever to be visible by ground-level Google imagery (and overhead satellite views usually don’t reveal the arch). We can, however, take a look at the few that are visible on Street View, beginning with Durdle Door on the south coast of England. This limestone arch was formed when a softer…

Read full article »