The Zimbabwe Secondary School Science Project (ZIM-SCI) developed student study guides, corresponding teaching guides, and science kits for a low-cost science course which could be taught during the first 2 years of secondary school without the aid of qualified teachers and conventional laboratories. This teaching guide, designed to be read in conjunction with the related student guide, includes instructional strategies, lists of required materials, laboratory procedures, and other information for activities, experiments, and field studies in a two-part unit in which students investigate: (1) the solar system; (2) structure and formation of the earth; (3) igneous, metamorphic, and sedimentary rocks; and (4) the nature and formation of soils. Characteristics of the major soil types found in Zimbabwe, the trees characteristically associated with these soils, and soil conservation are stressed. Each section in this guide corresponds to a given section in the student study guide. (JN)