Geophysics as a discipline, studies in detail the physical characteristics of earth and its environment. This field explores the internal structure of earth, surface dynamics and other phenomena of earth. The chapters provided in this book exhaustively discuss the theories of earth's structure and shape, seismology, fluid dynamics of oceans, and magnetic fields. The book presents researches and studies performed by experts across the globe. It aims to serve as a reference text for students and professionals alike and contribute to the growth of the discipline.