1. Canyons: These deep, narrow valleys are formed when rivers cut deeply into the earth over long periods. The Colorado River carved out the Grand Canyon, a prime example.
2. Meanders: These sweeping bends in a river are formed as the water flows over a relatively flat landscape. Erosion occurs on the outer bank of the bend, where the water flows faster, and deposition occurs on the inner bank, where the water is slower. Over time, the meanders can become increasingly pronounced.
3. Oxbow Lakes: These U-shaped lakes are formed when a meander is cut off from the main river channel. Erosion widens the neck of the meander, eventually causing the river to take a straighter course. The cut-off meander becomes isolated, forming a lake.
4. Floodplains: These flat, fertile areas are formed by the deposition of sediment during floods. When a river overflows its banks, it slows down and deposits its load of sediment, creating a wider valley floor.
5. Terraces: These step-like features are found along the sides of river valleys. They are formed when a river erodes downward, leaving behind a series of elevated, flat surfaces. Terraces can reveal past stages of river development.
