Isotope Geology: Unlocking the Secrets of Earth’s Past and Present Geology is the study of the Earth’s physical structure, history, and processes. It is a vast field that encompasses a wide range of sub-disciplines, each focusing on a specific aspect of the Earth. One of these sub-disciplines is isotope geology, which is a branch of geology that utilizes isotopes to study the Earth. Isotope geology has played a crucial role in expanding our understanding of the Earth’s history and is a valuable tool for predicting its future.