The study of rocks and the Earth's crust is called geology. Geologists analyze the composition, structure, and processes of the Earth to understand its history, the formation of various geological features, and the dynamics of its surface and interior. This field encompasses various sub-disciplines, such as mineralogy (the study of minerals), petrology (the study of rocks), and paleontology (the study of fossils). By examining rocks and their formations, geologists can uncover information about past environments, tectonic movements, and the history of life on Earth. Understanding geology is crucial for natural resource exploration and addressing environmental issues.