Deterioration of water

Copyright: Registered 21Jul72 · LP43062 (Jan-Jun 1974) Copyright holder: Learning Company of America, a division of Columbia Pictures Industries, Inc Production company: the American Meteorological Society

Description: Examines the phenomenon of polluted water by looking at sources of pollution; the role of the water cycle; methods of testing for pollutants; and purification method. Suitable for lower and middle secondary levels.