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The River Valley
· The path of a river as it flows downhill is called its course
· Rivers have un upper course, middle course and a lower
course
· Rivers form channels and valleys as they flow downhill
· They erode the landscape laterally (middle and lower) and
vertically (upper)…read more

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Erosion
Hydraulic Action
· The force of the water breaks rock particles away from the
river channel
Abrasion
· Eroded rocks picked up by the river scrape and rub against
the channel, wearing it away
Attrition
· Eroded rocks picked up by the river smash into each other
and break into smaller fragments. Their edges also get
rounded off as they rub together
Solution
· River water dissolves some types of rock e.g. chalk and
limestone…read more

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Transportation
Traction
· Large particles like boulders are pushed along the river
bed by the force of the water
Saltation
· Pebble-sized particles are bounced along the river bed by
the force of the water
Suspension
· Small particles like silt and clay are carried along by the
water
Solution
· Soluble materials dissolve in the water and are carried
along…read more

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Transportation Continued…read more

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Deposition
· Deposition is when a river drops the eroded material
it's transporting
· It happens when a river slows down (loses velocity)
· There are a few reasons why rivers slow down and
deposit material:
· The volume of the water falls
· The amount of eroded material in the water increases
· The water is shallower e.g. on the inside of the bend
· The river reaches its mouth…read more

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