These resource materials are a part of a larger plan for groundwater education, as detailed in the Iowa Groundwater Education Strategy. The six units are arranged in priority order. The first unit covers the basics of groundwater and hydrogeology in Iowa. The other five units cover Iowa's groundwater issues in priority order, as outlined in the Iowa Groundwater Protection Strategy 1987. Within each unit are a list of objectives, background information, and some activities. Many of the illustrations are a full page to allow teachers to make an overhead transparency for discussions. In each activity the title is followed by suggested subjects (earth and/or life science; all activities could be appropriate for general science) and an "average" length of time. The Quick Summary, Objectives, and Materials listings follow. The Printed/AV Materials section lists supplementary pages following the activity that could be used to make overhead transparencies, worksheets, etc. Other audiovisual materials that could be obtained may also be listed there. Sometimes more background is given in the Teacher Information section. The Procedure, Alternative, and Extensions all give ideas about how to implement these activities in a classroom. Six plexiglass groundwater models and a set of six groundwater posters accompany the set of GREAT materials when ordered from the Conservation Education Center. following topics are covered: (1) hydrology; (2) fertilizers and pesticides; (3) abandoned waste sites and landfills; (4) leaking underground storage tanks and hazardous materials handling and transportation; (5) direct paths of contamination; and (6) land-applied wastes and sewage treatment. More information on the water of Iowa, hazards of household products, publications on groundwater from the Department of Natural Resources, recycling directory, and information on composting are appended. (KR)