sentences:  Beaches on the south coast usually consist of coarser sand and shingle, interspersed with rocky sections of wave-cut platform.Raised beaches can be identified in various places these being geological evidence of past changes in sea levels.The interior of the county consists of a roughly east–west spine of infertile and exposed upland, with a series of granite intrusions, such as Bodmin Moor, which contains the highest land within Cornwall.