How Waterfalls Retreat and Carve Deep Gorges (Teach This Topic)

This plan supports a guided lesson on how contrasting rock resistance, erosion and collapse can cause a waterfall to retreat upstream and leave a gorge. The learner will build and explain the process sequence, interpret evidence from High Force on the River Tees, and evaluate a simple tray model. Use the questions, sketches and checks to identify misconceptions, especially the idea that a waterfall moves upstream as one solid object.

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