Challenge your students to understand the potential harm that lead presents to their lives and the environment. Lead is a naturally occurring stable element that accumulates in soil and water, as well as in the tissues of the plants and animals that grow in contaminated areas. In this hands-on lab activity, students discover how natural and industrial processes ultimately affect human health by testing simulated environmental water samples for the presence of lead. The results illustrate a toxic variation of a nutrient cycle. The cycling of environmental pollutants in the biosphere is a new and important concept for students who are growing up in an eco-conscious society. Complete for 30 students working individually. Super Value Kit is complete for 5 classes of 30 students working individually. A 0.1-g precision balance and other common laboratory supplies are required but not provided.