(a) Study Fig. 5, which is a cross section of a cliff and beach. [Fig. 5 is a cross section showing a cliff and beach. The vertical axis represents height in metres (0m to 30m). The horizontal axis represents distance in metres (0m to 40m). The cliff has layers of shale (above 10m) and sandstone (below 10m). At the base of the cliff is a 'wave-cut platform' which extends from 0m to approximately 34-35m horizontally. Beyond the wave-cut platform is a 'beach', sloping gently towards the 'sea'. The 'low water mark' is indicated at the seaward edge of the beach. The beach material is shown at two locations, X and Y, with pie charts. Key for beach material: - sand (dotted shading) - shingle (horizontal stripes) - pebbles (small circles) At X, beach material is mostly shingle and pebbles with some sand. At Y, beach material is mostly sand with some shingle.] (b) Study Photograph B (Insert), which shows an area of coastline. [Photograph B (Insert) would show an image of a coastline, likely featuring cliffs, a beach, and possibly a bay or headland.]