Source of the river that is 600m above sea level., After Cow Green Reservoir, at Cauldron Snout, the river is flowing quickly downhill, which leads to more vertical erosion. This eventually forms an interlocking spur., The river flows over the hard rock (Whin sill) and the soft rock (Sandstone), forming a waterfall. High Force waterfall is 21m tall., High relief and steep gradient, resulting in high energy., The valley becomes wider by lateral erosion developing a floodplain (up to ~10km wide)., Meanders are formed here, which can lead to ox-bow lakes. Yarm is built inside a large meander., Low relief and gradient, resulting in less energy, so more deposition. This contributes to the formation of floodplains and levees., Major industrial development: Steelworks, oil terminals, and power stations., Mouth of the river where it meets the sea., The estuary (transition zone between river and sea) has wide mudflats and sand banks..

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