A look at two waterfalls in different stages of development; High Force on the River Tees and an un-named smaller falls on a tributary of the Tees. The process of a waterfall eroding its way upstream and creating a gorge is explained. The difference in appearance between different types of falls is explained in terms of geology.
Could be used as a case study of landforms created by the erosional power of rivers (gorges and waterfalls). Provides a stimulus for the creation of a series of diagram showing the erosional processes that create a waterfall, as well as the types of waterfall that can be created.