The statement that “Currents shape rivers over long periods of time.” Is true. The force exerted by the water will give an impact on the land that is hit. It will create a pathway for water to flow if it is hit many times.
Most rivers begins life as a tiny stream running down a mountain slope small streams meet and join together, growing larger and larger until the flow can be called river. On its way down, the water shapes the landscape by wearing away rocks and carving out a network of valley.
currents of rivers do shape it. it erodes at the sides making it wider and different shapes.