Hydraulic Action: Force of the water hitting the bed and the banks.
Abrasion: When the load the river is carryig repeatedly hits the river bed causing some of the material to break off.
Attrition: When the stones and boulders carried by the river knock against each other and over time are weakened, causing bits to fall off and reduce in size.
Solution: When the river flows on certain types of rock such as chalk and limestone - they're soluble in rainwater.
Traction: Largest material: too heavy to lose contact with the bed so it's rolled along.
Saltation: Small stones and frains of sand bouncing along the bed. Lighter load.
Suspension: Carrying fine material that floats in the river
Solution: Dissolved load (chalk and limestone)
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