On average the North Norfolk coast is eroding at 1 - 3 metres per year. Some areas such as Happisburgh are threatened by much more rapid erosion at rates of up to 12 metres per year.
1. Marine Processes - the base of the cliff is eroded by hydraulic action and abrasion making the cliff steeper
2. Sub - aerial Processes - weathering weakens the rock eg. freeze thaw action/chemical weathering.
3. Sub - aerial processes - heavy rain saturates permeable rock and can erode the cliff as it runs down
4. Sub - aerial processes - water flows through permeable rock…