| A | B |
|---|
| Aquifer | a permeable rock layer than can hold or transport water |
| Catastrophic event | a violent, usually destructive, natural occurrence |
| Deposition | process by which weathered and eroded material is deposited by wind, water, or ice |
| Ecoregion | pattern of ecosystems with combinations of soil and landform that characterize region |
| Erosion | process by which weathered material is moved by wind, water, or ice |
| Groundwater | water beneath the Earth's surface |
| Permeability | ability of a material to allow water to pass through |
| pH | the measure of the concentration of hydrogen in a solution (e.g., acid, base) |
| Recharge zone | surface land area where water enters an aquifer |
| Surface water | water that collects above the surface of the ground |
| Watershed | an area of land where all of the groundwater and surface water from the area drains from higher areas to lower areas and into the same body of water |
| Water table | the highest level of groundwater in an area, beneath the Earth's surface |
| Weathering | process by which exposed rock and other surfaces are broken down; may be cause by elements of weather (wind, water, ice) or other mechanisms (physical, chemical, biological) |
