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Geobiology is the study of the interaction between rocks and life. Geobiologists investigate questions ranging from how organisms obtain energy from rocks to how evidence of life is preserved in rocks and informs us about the evolution of life on our planet and beyond. It is a rapidly expanding field because of its relevance to astrobiology, microbiology, paleontology, and reconstructing environmental change during ancient periods climate change with implications for evaluating our future under elevated atmospheric carbon dioxide levels. In this course, students will learn about how organisms drive major elemental cycles that impact climate and habitability, how major evolutionary radiations have affected the trajectory of Earth surface environments, and the tools that are used to ask fundamental questions about why life has thrived on this planet and how we might detect if other planets support life.