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River Tees source
Located in the Pennines at Cross Fell, a boggy, marshy moorland with high rainfall
Source characteristics
Saturated peat, cold climate, small streams joining to form the river
Upper course gradient
Very steep, causing rapid vertical erosion
Vertical erosion
Downcutting of the river bed due to high energy
V‑shaped valley
Formed by vertical erosion and freeze‑thaw weathering on valley sides
Interlocking spurs
River weaves around hard rock ridges in the upper course
High Force waterfall
Formed where hard Whin Sill lies over soft limestone, causing undercutting
Gorge formation
Created as High Force retreats upstream through erosion
Upper course sediment
Large, angular bedload
Solution (transport)
Dissolved minerals carried in wate