Here you will find resources to help educators and their students to construct and analyze a physical model of the movement of pollutants in ground water and determine how the pumping of water from wells influences this movement; Measure the level of nitrates in a stream within your community; Conduct a mathematical analysis (case study) of pollution of surface waters by road salt based upon a map, quantitative data, and initial assumptions; Identify and describe ways that human activity affects surface water and ground water quality in your community.