The term "geologic" refers to something related to or associated with geology, which is the scientific study of the Earth's structure and composition. This includes examining rocks, minerals, fossils, and other natural formations in order to understand the history and processes that have shaped our planet over time. The term "geologic" can be used as an adjective to describe something related to geology or a noun to refer to specific features of the Earth's crust such as rock layers, fault lines, or other geological formations.