This guide is one of three teacher's guides developed for the U.S. Geological Survey's Water Resources Education Initiative. Each guide supplements a set in the accompanying poster series which forms the core of this project. This guide covers navigating the water highways, groundwater, and water quality and helps teachers use the included Water Resources posters by providing background material and 12 activities that draw from or build on the poster series. In addition to background information about navigation, ground water, and water quality, the guide contains a discussion on how students can protect water, ideas for further student research, and a list of related resources. The 12 activities are hands-on explorations that involve students in a variety of environmental education topics. Two sets of posters accompany this guide, one for middle school and one for elementary school. (DDR)