The study of rocks is a broad field that encompasses three distinct disciplines: lithology, GENEALOGY, and petrology. Lithology is the study of the physical characteristics of rocks, such as their composition, texture, and structure. GENEALOGY is the study of the origin and evolution of rocks, including their formation, alteration, and classification. Petrology is the study of the chemical and mineralogical composition of rocks, as well as their physical properties. All three disciplines are essential for understanding the history and composition of rocks, and how they interact with the environment.