Name two directions a river can erode in.

Hydraulic Action and Attrition

rivers erode in four ways:

Abrasion or corrasion - This is when large pieces of bedload material wear away the river banks and bed.

Attrition - This is when the bed load itself is eroded when sediment particles knock against the bed or each other and break, becoming more rounded and smaller.

Hydraulic Action - This is when the force of water erodes softer rock.

Solution or corrosion - This is when acidic water erodes rock.

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