Erosion- Break up of rocks by action of rock particles being moved by wind water and ice.
Rivers erode because they posses energy. Total energy depends on:
- Weight of water- more mass = more energy- influence of gravity
- Height of river above base level (sea level)
- Steepness of channel- controls the speed of the river
Scraping and rubbing action of materials carried away by the load.
Sheer power of moving water.
Movement of loose unconsolidated material due to frictional drag of water.
Reduction in size of fragments and particles within a river due to rocks bashing together.
Become smoother, smaller and rounder.
Most active on rocks that contain carbonates such as limestone and chalk.