| Term | Definition |
|---|
| vadose zone | unsaturated zone or zone of aeration which immediately underlies the land surface, contains both water and air |
| saturated zone | beneath the vadose zone in which all of the interconnected openings are full of water |
| aquifer | a body of saturated rock or sediment that is capable of transimitting useful quantities of water to wells or springs |
| confining rock units | form the boundaries of aquifers |
| unconfined aquifer | a body of saturated sediment or rock not overlain by a confining unit |
| confined aquifer | confining layers |
| concentration contour | connects points of equal concentration |
| What other information could a hydrogeologist collect to further evaluate the hypothesis that the contamination origanted from the gas station? | checking surroundings, excavate gas tanks underground |
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