| A | B |
|---|
| streams and smaller rivers that feed into a main river | tributary |
| the land area that supplies water to a river system | watershed |
| materials that allow water to pass through | permeable |
| materials that do not allow water to pass through | impermeable |
| the area of permeable rock that is filled with water | saturated zone |
| any underground layer of permeable rock or sediment that holds water | aquifer |
| Water rises because of pressue within an aquifer and creates this | artesian well |
| Greensboro is in this River Basin | Cape Fear |
| examples of permeable materials | sand and gravel |
| examples of impermeable materials | granite and clay |
