Presents the theoretical explanation of the observation that when a pen that is stuck in a hard rubber ball and dropped, the pen may bounce to several times the dropped height. Includes the procedure and models created to explain the observations. (DS)

Suggests methods of teaching principles of geological inference by observation of sidewalks, parking lots, school grounds, and vacant lots. (AL)

Laboratory procedures are explained for taking benzoic acid and using it or one of its derivatives throughout an introductory lab course. Synthesis, purification, weight determination, identification of an acid, equilibrium constant, salt preparation, salt analysis, and salt solubility measurements are involved in the semester's experience. (DS)

Describes four elementary school earth science activities. Each student experience is designed to help children answer questions about the ocean floor, continental drift, volcanism and mountain chains. Includes a bibliography of related articles, books, and maps. (JM)

Discusses basic concepts for environmental education in elementary schools. Materials and activities are viewed in relation to instructional purposes and child development. Emphasis is placed on procedures with urban children. (JM)