Earth materials (bedrock and soil) affect all aspects of environmental and human health. They are the ultimate, natural sources of elements and compounds that can and do enter our air, food, and water. Earth materials contain real potential for harm in the form of naturally occurring toxic elements such as arsenic, lead, mercury, fluorine, cadmium, and radon — among a host of others. Although health hazards arising through exposure to these naturally occurring toxins are well known, the hazard potential of earth materials containing them is not. Medical Geology combines the knowledge of geosciences with health and health outcomes to improve human health? Terrrapetratox is the first Canadian company to provide Medical Geology services to organisations dedicated to improving human health. Our Services Terrapetratox provides Geology and Population Health Risk Assessment and Management services to government Health, Environment and Natural Resource departments; health and environmental advocates and associations; mortgage brokers, real estate and building associations; and companies operating in areas of high radon and arsenic levels. Our services include: •Medical Geologist •Radon and Arsenic Potential Mapping •Population Health Risk Assessment •Public Speaking Engagements and Information on Medical Geology •Environmental Epidemiology •Systematic Reviews (Cochrane Reviews)