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In this activity, students learn about the biological and physical conditions that lead to eutrophication of a water system by using real-time data to predict the the growth of harmful algae. They also conduct research on the Internet to learn more about the causes of harmful algal blooms. Students investigate both the position of the Gulf Stream, as well as population and life cycle characteristics of harmful phytoplankton. The activity includes a worksheet and assessment questions. This resource is found in Rising Tides, a journal created for teachers and students reporting on current oceanography research conducted by NASA, NOAA, and university scientists, featuring articles, classroom activities, readings, teacher/student questions, and imagery for student investigation of marine science.