Explores the interaction of the biosphere, geosphere, and atmosphere on Earth, with focus on biogeochemical cycles and the methods used to study them. Examination of conditions on Early Earth and the changes brought by the introduction of life. Course Information: Prerequisite(s): CHEM 122 and CHEM 123; and EAES 330 or EAES 385 or EAES 111; or consent of the instructor. Recommended background: BIOS 110.