The formation of a wave-cut platform and a stack are illustrated. 'Hard' coasts and 'soft' coasts erode at different rates and form different features. The formation of a wave-cut platform created when a cliff recedes is illustrated. Weaknesses at the base of a headland are increased through erosion. Over time, gaps in the rock grow to form first a cave, then an arch, culminating in the formation of a stack.

First broadcast:
17 October 2007

Could be used to create a series of diagrams explaining the formation of various coastal landforms. A range of places where these features are found are mentioned, so these could be used as case studies.

This clip could also be used to play ‘keyword bingo’. The class are told the topic areas featured in the clip, pupils then each come up with keywords likely to be said and put them in a 3x3 grid: the first person to get two lines wins.