| A | B |
|---|
| tributaries | large streams or small rivers that flow into a big river |
| drainage basin | area drained by a main river and its channels |
| immature river | a young river; a river in an early stage of development |
| mature river | an old river; a river that has been here for thousands of years. |
| levees | ridgelike deposits along the river sides. |
| oxbow lake | a U-shaped lake made by deposited rocks that cut off a meander of a river |
| alluvial fan | a fan-shaped deposit of rocks and sand at the point where a river leaves the mountains and runs out onto a plain |
| delta | a triangular formation of sediments deposited at the mouth of a river that flows into sea or a lake |
| flood plain | a flat area on both sides of a river that is made by rocks and sand deposited during floods |
| meanders | loops in a river |
