This environmental unit is one of a series designed for integration within an existing curriculum. The unit is self-contained and requires little teacher preparation. The philosophy of this series is based on an experience-oriented process that encourages self-paced independent student work. This particular unit is designed to involve students in contour mapping activities that demonstrate certain principles of geometry. Preliminary activities include directions for building contour mapping equipment. The remaining activities are concerned with the use of this equipment in constructing a contour map. At the end of the unit are six pages ofgraphic information that can be duplicated and distributed to the students. Teacher information includes materials needed, directions for assembling equipment, background information, and additional topics. This unit is designed for students, grades 4-9. (MA)