Which process involves stones rolling along the river bed?

The process involving stones rolling along the riverbed is called "bedload transport." This occurs when the flow of water in the river provides enough energy to move larger sediment particles, such as gravel and stones, along the bottom of the river. The rolling motion is primarily caused by the force of the water pushing against the stones, causing them to tumble and shift position. This process contributes to the river's erosion and sediment transport dynamics.