This teacher's guide on acid rain is divided into three study areas to explain: (1) what causes acid rain; (2) what problems acid rain has created; and (3) what teachers and students can do to help combat acid rain. Instructions for activities within the study areas include suggested grade levels, objectives, materials needed, and directions for the teacher. Many of the activities are science experiments or investigations. Experiments involve learning about acidity, the water cycle, sources of acid rain pollution, air-borne particles, acid rain's effects on aquatic life and plant seedlings, and the buffering capacity of types of soil. Other activities involve talking with people in the community, learning about the Clean Air Act, and writing letters to elected representatives. It is suggested that the activities could be incorporated into many subject areas and that a motivating study approach would be to organize the class into small study teams. A crossword puzzle, a glossary, and a bibliography of 17 journal articles, one filmstrip with cassette, one film, and one set of curriculum materials is included. (EM)