geo
·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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