Crustal Evolution Education Project (CEEP) modules were designed to: (1) provide students with the methods and results of continuing investigations into the composition, history, and processes of the earth's crust and the application of this knowledge to man's activities and (2) to be used by teachers with little or no previous background in the modern theories of sea-floor spreading, continental drift, and plate tectonics. Each module consists of two booklets: a teacher's guide and student investigation. The teacher's guide contains all of the information present in the student investigation booklet as well as: (1) a general introduction; (2) prerequisite student background; (3) objectives; (4) list of required materials; (5) background information; (6) suggested approach; (7) procedure, recommending three 45-minute class periods; (8) summary questions (with answers); (9) extension activities; and (10) list of references. Assuming knowledge of magnetism, latitude, longitude, geographic poles, and mid-ocean ridges, activities give students experiences with magnetic polarity and polarity reversal, including using a compass to determine magnetic field direction, using data on magnetic field direction and age of rocks in sea floor to find direction and rates of sea-floor spreading, explaining how paleomagnetic data are used in studying earth history, and locating older/younger sea floor parts. (Author/JN)