Geology is the study of structures of the earth. It focuses on understanding the composition, processes, and history of the Earth's materials, including rocks, minerals, and the various layers of the Earth's crust. Geologists examine the formation of mountains, volcanoes, and other geological features, as well as the forces that shape the Earth's surface over time. They also study the Earth's history through the analysis of fossils and other geological evidence. By studying the structures of the Earth, geologists gain insights into the planet's past and present, and can make predictions about future geological events.