| A | B |
|---|
| sediment | Earth materials deposited by erosion. |
| deposition | Process in which sediment is laid down in new locations. |
| mass movement | Any one of several processes by which gravity moves sediment downhill. |
| runoff | Water that flows over the ground surface rather than soaking into the ground. |
| rill | A tiny groove in soil made by flowing water. |
| gully | A large channel in soil formed by erosion. |
| stream | A channel through which water is continually flowing downhill. |
| river | A large stream. |
| tributary | A stream that flows into a larger stream. |
| drainage basin | The land area from which a river and its tributaries collect their water. |
| divide | The ridge of land that separates one drainage basin from another. |
| flood plain | Wide valley through which a river flows. |
| meander | A looplike 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 range. |
| delta | A landform made of sediment that is deposited where a river flows into an ocean or lake. |
| groundwater | Wather 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 cone-shaped calcite deposit that builds up from the floor of a cave. |
| karst topography | A type of landscape in rainy regions where there is limestone near the surface, characterized by caverns, sinkholes, and valleys. |
