Grade 4 and up. Introduce students to stream/river ecosystems through a classroom-based tour of a virtual watershed. Students learn about stream ecology, water quality issues, and their own connection to a watershed. Through a week-long series of hands-on TesTabs® tablet tests, exercises, and activities, students sample 4 stations along a river continuum—from the headwater to the mouth of the river as it enters the estuary—to study how the stream changes and how human activities can influence water quality. Includes lecture materials, illustrated handouts, teacher tips, test procedures, TesTabs® reagents, data sheets, and exercises to reinforce key concepts. Kit contains reagents and test tubes for 50 students working in groups. Refill includes consumable components.