This publication, developed by the Ministry of Education, Province of British Columbia, Canada, is a teaching guide for the Geology 12 course. The course is intended to provide secondary school students with the background and desire to investigate their earth, its materials and its processes. The guide consists of the following four sections: (1) Physical geology; (2) Historical geology; (3) Earth resources; and (4) Planetology. Learning outcomes, suggested activities and investigations, a list of references, and instructional aids are also included in each section. A list of equipment and supplies, audiovisual materials, supplementary reference texts and prescribed textbooks are presented in the appendix. An introduction including the purpose of the course, terms, and definitions is also presented. (HM)