Geologic history is the study of the Earth's past, focusing on the formation and evolution of the planet over millions or even billions of years. This field of research includes studying the processes that have shaped the Earth's surface, such as plate tectonics, erosion, and sedimentation. Geologists analyze rock formations, fossils, and other geological features to piece together a timeline of the Earth's history and understand how it has changed over time. By studying geologic history, researchers can gain insights into past climates, ecosystems, and geological events that have influenced the Earth's current state.