Rivers shape the landscape over time through erosion, transportation, and deposition of sediment. As rivers flow, they erode the land by carrying away rocks, soil, and other material. This erosion can create valleys, canyons, and other landforms. The sediment carried by rivers is then transported downstream, where it can be deposited along the riverbanks or at the river mouth. Over time, this deposition can build up new landforms such as river deltas. Overall, rivers play a significant role in shaping the Earth's surface through their erosional and depositional processes.