Overview This extension explores alternative uses of the Sand-Land model. By injecting food color into the soil, students can simulate the movement of a chemical contaminant in groundwater and surface waters. The sandbox demonstration helps students visualize the invisible-underground a part of the water cycle and can serve as a starting point of discussions on the impact of human activities on watersheds.
Materials See Preparation.
Lesson Plan Class Setting Students work in groups of 4 to 5 students. Each group gets one sandbox. And each student gets one activity card . Script of class interaction Lecture Give a short introduction on underground sources of contamination, such as leaking tanks that store chemicals. Developing a hypothesis from previous experience.