Included are two of the eight units of the Intermediate Science Curriculum Study materials designed for grade nine students. These are "Why you're you" (genetics), and "Crusty problems" (earth science). The first unit includes basic chapters and "excursions" which extend some of the ideas developed in the basic chapters. The second includes basic chapters and resource suggestions. Introductory notes to the student explain how the book is to be used. In the genetics unit each chapter starts with a statement of a general problem, then concepts are developed through laboratory activities and problems. The workbook format gives instructions for activities interspersed with questions and spaces for answers. All instructions and many other sections are illustrated, and data tables are provided for students to fill out. The chapters of the earth science unit include many questions which students cannot answer without using the resource sections. Some of the resource sections include activities, others provide data or descriptive material. Students are required to select the relevant resources for themselves. (EB)