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How Natural Processes Operate at Coastal Geographic Environment. Natural Processes are actions or events that have natural causes, which result in natural events. The three main coastal environment processes that operate at Muriwai are Coastal Erosion, Coastal Tr ....

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.... this is at Maori Bay. Coastal Erosion operates at different rates and different times. Limestone rock is eroded slower than sedimentary rock. The cliff at Muriwai made of sedimentary rock was eroded back to expose ‘Fisherman’s Rock’ - the shore platform which, made of limestone – tended to erode back slower than the cliff. The types of wave erosion that caused this are - Hydraulic Action, when waves hit the cliff, air is forced into cracks, and then as the wave retreats this air expands explosively. Over time the cracks enlarge, weakening the base of the cliff causing erosion. Attrition is the breakdown of rock particles ....