Assess students' ability to analyze how changes in land use within a watershed (e.g., agriculture, urbanization, deforestation) alter nutrient inputs and runoff dynamics that trigger algal blooms in freshwater lakes; tasks should include interpreting simple maps and graphs of land cover and nutrient concentrations, identifying cause–effect relationships and dominant nutrient sources, estimating relative contributions, and proposing evidence‑based mitigation strategies appropriate for grade 6–8 advanced learners.