Geochemistry applies chemical principles to the Earth sciences in order to further our understanding of the Earth and other planetary systems. As a geochemist, you will examine the composition of rocks and soils, the cycles of Earth's chemical components, and the interaction of those cycles with land, water, and the atmosphere. In their careers, geochemists often study and evaluate geologic hazards, natural resources, and environmental issues such as climate change and groundwater contamination. Geochemistry applies knowledge of chemical systems to understand the Earth, the atmosphere, hydrosphere, and biosphere. Geochemists analyze elemental and isotopic abundances to understand physical chemical and biological processes occurring within the Earth System. Many geochemists are employed as consultants or in government agencies tasked with environmental assessment of soil, water, and air quality, as well as work in identifying and managing natural resources.