Is this statement true sediment in a river abrades the stream bed and is abraded by the stream bed in return?

Yes, the statement is true. Sediment in a river can cause abrasion as it moves along the stream bed, wearing down the rocks and sediments it encounters. Conversely, the stream bed also abrades the sediment, further shaping and breaking it down. This mutual abrasion contributes to the overall erosion and shaping of the river landscape.