Why do river landscapes in the UK vary, and what are the processes shaping them? GapFill

In the uplands, a river may not flow in a straight line. It will erode downwards and zigzag around harder rock instead of eroding laterally. This formation is called   interlocking spurswaterfallsriver banksrapids.

A levée is a  lakeplainriverridge that runs either side of a river. It is formed by  depositionwaveshumanserosion.  When a river floods, it drops its  loaddamdepositionerosion right next to the river. This builds up the levées. A floodplain stretches either side of a  narrowerdeltaflood plainriver.  This is made by erosion and deposition. The meanders move downstream, and cutting into the valley sides making the valley  lakeriverwidernarrower.

Meanders start life as a straight river, but, during the summer low flows, material is deposited, creating a deeper channel. Erosion occurs, undercutting the  channelestuarybankgravel through lateral erosion to form a bend in the river, and river cliff, while on the other side a beach called a   slip-off slopechannelestuarygravel forms from deposited material. Over time, the meander becomes enlarged, but the river starts to cut off the meander by forming a direct channel across, eroding its '  neckheadarmstoes'. Most of the water now flows through the straight channel rather than around the loop, so   undercuttingdepositionwatererosion starts to seal off the meander. Once the meander is fully cut off from the river, the feature is called a/an   deltainterlocking spurplunge pooloxbow lake.

Deposition happens when the river  burstsstays withinundercutswidens its banks. When a river flows into the sea, deposition can occur to form an  spitestuaryriverload, where wide mudflats are exposed at low tide. When a river meets the sea, itcan form a wide, fan-shaped feature called a   lakedunemeanderdelta as sediment is deposited into the sea, leading to the river branching into several channels.