Large materials such as pebbles and boulders carried along by a stream are what?

Large materials such as pebbles and boulders carried along by a stream are referred to as "bed load." This term describes the sediment that moves along the bottom of a river or stream, primarily through rolling, sliding, or bouncing. Bed load is distinct from suspended load, which consists of finer particles carried within the water column. The movement of bed load can influence the stream's shape and ecosystem.