Module 12

3. Pertaining to water that tastes agreeable and is not dangerous to human health.
10. The sum of all precipitation that flows over the land surface, including not only streams but also the fraction that temporarily infiltrates near-surface soil and rock and then flows back to the surface.
11. A relatively impermeable formation that bounds an aquifer above or below and acts as a barrier to the flow of groundwater.
13. A summary of the relationships among the volume of water flowing through an aquifer in a certain time. the vertical drop of the flow, the flow distance, and the permeability of the aquifer.
14. The boundary between the unsaturated zone and saturated zone.
15. A porous formation that stores and transmits groundwater in sufficient quantity to supply wells.
16. The ratio between the difference in elevation between two points in the groundwater table and the flow distance that water travels between the two points.
18. The cylindrical movement of water from the ocean to the atmosphere by evaporation, to the surface by precipitation, to streams through runoff and groundwater, and back to the ocean.
19. A spontaneous flow of groundwater through a confined aquifer to a point where the elevation of the ground surface is lower than that of the groundwater table.
21. The amount of water vapor in the air, expressed as a percentage of the total amount of water the air could hold at the same temperature if it were saturated.

1. The volume of water that flows beneath Earth's surface.
2. The level above the groundwater table, in which the pores of the soil or rock are not completely filled with water.
4. A deposit on Earth's surface of condensed atmospheric water vapor in the form of rain, snow, sleet, hail, or mist.
5. The movement of water into rock or soil through cracks or small pores between particles.
6. An irregular, hilly type of terrain characterized by sinkholes, caves, and a lack of surface streams; formed in regions with humid climates, abundant vegetation, extensively jointed limestone formations, and appreciable hydraulic gradients.
7. A period of months or years when precipitation is much lower than normal.
8. A small, steep depression in the land surface formed when the thin roof of a limestone cave collapses suddenly.
9. The level below the groundwater table, in which the pores of soil or rock are completely filled with water.
10. An area of low rainfall on the leeward slope of a mountain range.
12. The ability of a solid to allow fluids to pass through it.
17. The volume of groundwater leaving an aquifer in a given time.
20. The infiltration of water into any subsurface rock formation.