| A | B |
|---|
| groundwater | water held in the soil or permeable rocks |
| permeable | porous |
| zone of aeration | soil containing air and water |
| zone of saturation | area below the water table completely full of water |
| water table | the point under ground completely saturated with water |
| aquifer | area underground where water can be extracted |
| surface water | water collecting on the ground such as a river or stream |
| runoff | the flow of water over land |
| watershed | an area of land where all the water drains off to one place |
| drainage basin | an area of land where surface water drains to one point |
| divide | a line separating drainage basins |
