Geology is the scientific study of the Earth's surface, its evolution and the processes that have led to its change. The demonstration of the age of the Earth, chronicling of the Earth's geological history, evidence for plate tectonics, and the understanding of past climates have been possible because of advancements in the field of geology. Rock analysis is the most significant area of geological studies. Rock can be of three types, namely sedimentary, igneous and metamorphic. The techniques used in geological investigations are fieldwork, chemical analysis, numerical modeling, rock description and physical experimentation. Hydrocarbon and mineral exploration, hydrological studies, understanding of natural hazards and past climates, etc. are explored from within the framework of geology. This textbook is a valuable compilation of topics, ranging from the fundamental to the most complex theories and principles in the field of geology. It further elucidates the techniques and applications of geology in a multidisciplinary manner. The book strives to be a complete source of information for all students who are looking for an elaborate reference text on geology.