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9 Cards in this Set

  • Front
  • Back

Hydraulic Action

The pressure of the water breaks the rock particles away from the bed and banks. This is strongest in Rapids and waterfalls.

Abrasion

Eroded pieces of rock in the water scrape and rub against the bed and banks, removing material. Most erosion happens by abrasion.

Attrition

Eroded rocks smash into each other and break into smaller fragments. Their edges also get rounded off. It does not erode the banks or bed. Just makes the rocks smaller and more rounded.

Cavitation

Air bubbles in turbulent stretches of water implode causing shockwaves that break pieces of rock of the banks and bed.

Corrosion

The dissolving of rock by chemical processes. Carbon dioxide dissolves in water to form a weak acid. This reacts to rocks like limestone and chalk breaking them down.

Solution

Substances that can dissolve are carried along the water. Limestone is dissolved into river water that's slightly acidic.

Suspension

Very fine material, like silt and clay particles, is whipped up by turbulence(erratic swirling of water) and carried along in the water. Most eroded material is Transported away.

Saltation

Larger particles, like pebbles or gravel, are too heavy to be carried in suspension. Instead. The force of the water causes them to bounce along the river bed.

Traction

Very large particles like boulders, are pushed along the river bed by force of the water.