LESSON 2: A MUCKY MYSTERY: A NUTRIENT ENRICHMENT CASE STUDY Students complete a reading about three teens who visit the Saginaw Bay to go swimming and encounter decaying vegetative muck washed up along the shoreline. Students interact with a mystery script and activity prompts that reveal clues as the teens investigate why the beach has so much muck. Students learn about other characters who have a stake in the phenomenon as they uncover the interaction between land use and water quality. Students react to questions and sketch and revise a model that reflects their discoveries about how multiple causes on land are connected to excess nutrients in the Saginaw Bay.