| A | B |
|---|
| runoff | water that doesn't soak into the ground |
| rill erosion | water erosion due to runoff; create small channels |
| gully erosion | when a rill channel becomes broader |
| sheet erosion | rainwater flows over a gentle slope, maoves sediments from entire surface |
| drainage basin | land area drained by a river syster |
| meander | a curve in a mature stream |
| flood plain | broad valley floor carved by a meandering stream |
| alluvial fan | triangular deposit of sediment that forms when water loses its energy |
| delta | a triangular deposit of sediment formed when a river slows and empties into an ocean |
| ground water | water that soaks into the ground and collects in pores |
| permeable | water can pass through |
| impermeable | water can not pass through |
| aquifer | layer of permeable rock that transmits water freely |
| zone of saturation | the area where all of the pores in the rock are filled with water |
| water table | upper surface of the zone of saturation |
| artesian well | a well in which water under pressure rises to the surface |
| spring | water flows out of the water table and reaches the surface |
| hot spring | heated ground water comes to the surface |
| geyser | a hot spring that erupts periodically and shoots water and steam into the air |
| cave | underground opening formed by dissolved limestone rock |
| Young Stream | flows swiftly through a steep valley, rapids and waterfalls |
| Mature Stream | flows less swiftly, rocks eroded, meanders |
| Old Stream | flows slowly through a flood plain that it made by erosion |
| River System | contains streams in all stages of development, like a tree |
| Longshore current | a source of shoreline erosion |
| beach | deposits of sediment that run parallel to the shore |
| barrier island | sand deposits that run parallel to the shore but are separated from the mainland |
| channel | a groove made by water running down the same path |
