Coastlines may look stable but they are one of the most dynamic features in the physical world. People and places -Physical geography - Coasts Learning Points The coast is where the land meets the sea or ocean. Waves wear away and break up rocks through the process of erosion. A Twig Curriculum Film. Delivering key learning points. Get straight to the facts in just three minutes – directly linked to core learning, Twig's curriculum films will fit neatly into your lesson plans.