A lecture and lab course emphasizing the role of microbial processes on elemental and pollutant cycling in terrestrial soils and aquatic sediments. Soils and sediments from different ecosystems are evaluated for microbial community composition and biogeochemical cycling of organic and inorganic nutrients and pollutants using advanced molecular and laboratory techniques. Several all day field trips and laboratory exercise required. Limited to eight students total, at the senior or higher level standing. Prereq: CHE 105, 107, 111, 113. Same as: PLS 450G.