Geophysics: Unlocking the Secrets of the Earth Geophysics is a branch of earth science that combines physics, mathematics, and geology to study the physical processes and properties of the Earth. It is a broad field that encompasses everything from the study of earthquakes and volcanoes to the formation of mountains and the structure of the Earth’s interior. One of the key principles of geophysics is that everything on Earth is interconnected and influenced by the underlying physical processes of the Earth.