- Scraping, scouring and rubbing action - materials carried along by a river (load).
- Rivers carry rock fragments in the flow of the water + drag them along the bed= wear away the banks and bed of the river channel.
Hydraulic action
- Sheer power of moving water.
- Movement of loose unconsolidated material - frictional drag of the moving water on sediment lying on the channel bed.
Corrosion
- Rocks that contain carbonates, such as limestone and chalk.
- Minerals = dissolved by weak acids in the river water + carried away in solution.
Attrition
- Reduction in the size of fragments and particles within a river due to the processes describe above.
- Fragments strike one another as well as the river bed.
- Become smoother, smaller + more rounded as they move along the river channel.
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