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Sediment is eroded (mainly) rock carried down stream by a river. As the river flow slows heavier particles fall and settle on the river bed. Lighter particle are carried the furthest out into the sea, where they too settle on the sea floor. Storms, floods and shifting tidal currents can alter or change the amount of sediment the river carriers and the rate at which the sediment settles in the sea. The finest sediment is known as silt, and is the slippery mud that lines the tidal estuary creeks where the river flow is the least.

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12y ago

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