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. Activities in this module focus on investigating magnetic characteristics of a sea-floor model in the vicinity of a wide-ocean ridge. The model affords concrete, manipulative experience with the interpretive notions of mirror image (normal and reverse) magnetic patterns, with the amount and rate of sea-floor spreading, and the opportunity to suggest possible ways in which the magnetic pattern could have been formed. (Author/JN)