Assess students' ability to analyze how land use changes in a watershed (urbanization, agriculture, deforestation, riparian alteration) influence water quality indicators (nutrient and sediment runoff, turbidity, dissolved oxygen, temperature, pollutants) and aquatic biodiversity (species richness, habitat availability, food-web impacts). Tasks include interpreting simple maps and graphs, identifying causal links between land use and ecological responses, evaluating basic monitoring indicators (e.g., macroinvertebrates, turbidity), and proposing practical mitigation measures. Scope: Grade 6–8, medium difficulty, analytical focus.