A natural science elective can be any astronomy course, any biology course, any chemistry course, any geology course, any meteorology course, any physical science course, any physics course, or ENVR 106 Intro to Hazardous Materials, ENVR 207 Chemistry of Hazardous Materials, ENVR 300 Toxicology, ENVR 315 Fundamentals of Industrial Hygiene, and ENVR 415 Advanced Industrial Hygiene. This listing can be found in the MSU Catalog.