| A | B |
|---|
| Gradient | The slope or steepness of a stream channel |
| Discharge | The volume of water flowing past a point per unit time |
| Missouri River | Longest river in the US |
| Mississippi River | Largest river in the US by discharge |
| Tributary | A stream that empties into another stream |
| Base level | The lowest point to which a stream can erode its channel |
| Delta | Accumulation of sediment where a river enters an ocean or lake |
| Columbia River | Borders Oregon and Washington State |
| Rio Grande River | Borders the US and Mexico |
| Colorado River | Borders Arizona and California |
| Red River | Borders Texas and Oklahoma |
| Ohio River | Borders Indiana and Kentucky |
