Rivers shape landscapes over time through erosion, transportation, and deposition of sediment. As rivers flow, they carry sediments downstream, gradually wearing away rocks and soil along their banks. This erosion can create valleys, canyons, and other landforms. The sediments that rivers transport can also be deposited in deltas, floodplains, or riverbanks, altering the landscape further. Additionally, rivers can carve out new pathways through the land, changing the course of their flow and reshaping the surrounding terrain.