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. Using four types of data recorded by geologists, students determine the position of the mid-Atlantic ridge as it crosses Iceland, the only extensive area of plate growth lying above water. In addition to examining types of geological activity in Iceland related to plate growth and fitting data consistent with a single explanation, benefits and hazards to Iceland's citizens resulting from being on the mid-Atlantic ridge are examined. (Author/JN)