| A | B |
|---|
| groundwater | the water that is beneath Earth's surface |
| aquifer | a body of rock or sediment that stores groundwater & allows the flow of groundwater |
| porosity | the percentage of the total volume of a rock or sediment that consists of open spaces |
| permeability | the ability of a rock or sediment to let fluids pass through its open spaces, or pores |
| water table | the upper surface of underground water; the upper boundary of the zone of saturation |
| artesian formation | a sloping layer of permeable rock sandwiched between 2 layers of impermeable rock & exposed at the surface |
| cavern | a natural cavity that forms in rock as a result of the dissolution of minerals; large cave containing many smaller, connecting chambers |
| sinkhole | circular depression that forms when rock dissolves, when overlying sediment fills an existing cavity |
| karst topography | a type of irregular topography characterized by caverns, sinkholes, underground drainage |
