This guide, the third in a series of three, provides the intermediate science student and teacher an opportunity to review selected science concepts and processes through activities which emphasize the applicability of scientific knowledge in the professional world. The three components in this guide deal with (1) the scientific principles of heating and cooling as related to careers in the environmental field; (2) the scientific knowledge necessary for professions in public service, in particular weather forecasting; and (3) the scientific skills necessary for transportation careers, with emphasis on satellite research and space travel. The activities in each of the components reinforce the student's skills in processes such as classifying, interpreting data, and controlling variables. Each activity contains an objective, key words, and a listing of materials needed to complete the learning experience. Simple experiments that students can perform have been included when applicable. In addition, the teacher is provided with a step-by-step outline of suggestions on how to implement the activity. An optional section in each component entitled "Home and Community" provides projects for extending the skills and knowledge gained to those areas. (NCR)