·Corrasion – Wearing away of the river bed and banks by the load hitting against them.

·Attrition – Wearing down of the load as the rocks and pebbles hit the river bed and each other.

·Hydraulic Action – Breaking away of river bed and banks by the sheer force of the water getting into small cracks.

·Chemical Action (Corrosion) – Water dissolves minerals from the rocks and washes them away.

·Traction – Quite large stones can be rolled or dragged along the river bed by the force of the water.

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