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Most erosion does occur underwater. In oceans, this may be hydraulic action similar to that seen in rivers, of material may be dislodged due to a turbidity current.

In rivers, this could be hydraulic action (water forcing air bubbles into cracks in the banks, or the force of the water itself), abrasion (rocks hitting the banks and bed), attrition (rocks hitting each other) or solution (dissolving).

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13y ago

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