This book provides five instructional units on groundwater. Units included are: (1) "Where's the Groundwater?" (describing the concepts of a saturated zone, water table, hydrologic cycle, recharge and discharge, core of depression, subsidence, and saltwater intrusion); (2) "How Does It Travel?" (discussing porosity, permeability, impermeability, sedimentary rock, crystalline rocks, faults, unconsolidated deposits, aquifer, and artesian well; (3) "What's in the Groundwater?" (discussing septic systems, toxic materials, leachates, landfills, hazardous waste sites, nitrates, and radioactive wastes); (4) "Virginia's Regions" (describing five main geologic regions); and (5) "What We Can Do to Help." The publication contains many diagrams, demonstrations, and a glossary. (YP)