The fantastic picture above is a famous natural arch in Pembrokeshire, South Wales. It is known as the Green Bridge of Wales and was formed through erosion of the cliff face by destructive waves. The photo shows all the features that you would be expected to label in a fieldsketch; an arch, stack, stumps, wave-cut notch and wave-cut platform.
The video shows the waves crashing against the cliff. The processes of erosion such as Hydraulic Action and Abrasion have helped to create the features. Hydraulic Action is when the waves get into cracks in the cliff, compressing the air and creating tiny explosions, weakening and eroding the rock. Abrasion uses any small pieces of rock and crashes them against the cliff, and is a powerful form of erosion.
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