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Erosional landforms (Upper course (Interlocking spurs (You need bands of…
Erosional landforms
Upper course
Interlocking spurs
You need bands of hard and soft rock
River cant erode through hard rock
So weaves its way through the hard rock
Waterfalls
Occurs when you have a layer of hard rocks on top of a layer of soft rock
River undercuts the soft rock
Creating a shelf of hard rocks
Plungepool developes
Hard rock callapses
V-shaped valleys
A rivers aim is to erode vertically to reach sea level
As the river cuts down, the steep sides are weathered and fall into the channel to be carried downstream
Weathered material falls into the channel making the valley sides less steep
Over time this creates a v- shaped valley
Gorges
The repetition of the hard rock collapsing creates a retreating waterfall and a gorge
Lower course
Levees
When a river floods its velocity is decreased
This means its deposition increases
The heaviest load is deposited near to the bank
The process is repeated
Floodplains
The river when flood
Middle course
Meanders
On the outside bend of a rive the current flows faster tan on the inside bend
Therefore erosion is greater of the outside bend and deposition is greatest on the inside bend
This causes the river to gradually bend
Ox-bow lakes
Due to erosion the necks of the meander become closer
The river finally breaks through the neck and forms an oxbow lake
River Tees
High force waterfall
Tidal estuary