Included is a teachers resource collection of 42 marine science activities for high school students. Both the biological and the physical factors of the marine environment are investigated, including the study of tides, local currents, microscope measuring, beaches, turbidity, sea water solids, pH, and salinity, marine bacteriology, microbiology, bioluminescence, taxonomy, plankton, sponges and speculation, pelecypod gill, crustacea, sea urchin development, salinity tolerances, and other topics. Most activities are performed in the laboratory, but sample gathering requires access to ocean beaches. Activities are generally presented in the format--separate introductory statements to the teacher and to the student, problem statement, materials, procedure, and questions. The source book could serve as a laboratory manual. This work was prepared under an ESEA Title III contract. (PR)