大象传媒

A detailed look at how caves, arches and stacks are formed at the coastline. Within a cliff face there can be sections of weaker rock which, over time, can erode to create caves. An arch starts off as two caves on a headland, but erosion takes it one step further and joins them together as an arch. Over hundreds of years, the arch becomes thinner and weaker until it comes crashing down, leaving a stack in the sea.