| A | B |
|---|
| Runoff | Water that flows over the ground surface |
| Rill | A tiny groove in the soil made by flowing water |
| Gully | A large channel in soil formed by erosion |
| Stream | A channel through which water is continually flowing downhill. |
| Tributary | A stream that flows into a large stream. |
| meander | A bend in the course of a river |
| Oxbow lake | A meander cut off from a river |
| Alluvial fan | A wide sloping deposit of sediment formed where a stream leaves a mountain |
| delta | A landform made of sediment that is deposited where a river flows into an ocean or lake |
| groundwater | Water that fills the cracks and spaces in underground soil and rock layers |
| stalactite | A calcite deposit that hangs from the roof of a cave |
| stalagmite | A calcite deposit that builds up on a floor |
| Flood plain | Wide valley through which a river flows |
