AP Environmental Science has a significant laboratory and field investigation component. The goal of this component is to complement the classroom portion of the course by allowing students to learn about the environment through firsthand observations. Experiences both in the laboratory and in the field provide students with important opportunities to test concepts and principles that are introduced in the classroom, to explore specific problems with a depth not easily achieved otherwise, and to gain an awareness of the importance of confounding variables that exist in the “real world.” Examples of investigations include: collecting and analyzing water and soil samples, conducting long term studies on a local ecosystem or environmental problem, analyzing real data sets, and visiting local public facilities such as a water-treatment plant. The laboratory and field component will challenge students’ abilities to: