Course will provide students with a chemical basis for understanding the natural environment and current environmental issues. Topics will include: the composition of the natural environment, the chemistry supporting environmental processes, and the main reactions of natural & anthropogenic chemicals in the atmosphere, water, and soils. Note: This course may be listed as either BIOL 3245 or CHEM 3245. Credit can not be obtained for both BIOL 3245 and CHEM 3245.