Caves, Arches and Stacks

You may recognise the above photo as being the basis for the memory map we did about cave, arch and stack formation. Basically they form on headlands, where a weakness in the rock is eroded initially to form a cave. The cave gets eroded through to form an arch. Eventually the arch cannot support itself and collapses, leaving a stack. The stack gets undercut, developing a wave cut notch, that will cause the stack above it to collapse leaving a stump. The following website has an animation showing the process http://www.sln.org.uk/geography/Documents/animations/Stack%20formation.ppt#264,1,Cave Arch and Stack Formation