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 two-three 45-minute class periods required; (8) summary questions (with answers); (9) extension activities; and (10) list of references. In this module students examine and graph data from sediments on the sea floor to determine if the data support the theory of sea-floor spreading. Calculations are made to determine the rate of spreading of the East Pacific Rise. (Author/JN)