Geophysics () is a subject of natural science concerned with the physical
processes and physical properties of the Earth and its surrounding space
environment, and the use of quantitative methods for their analysis.
Geophysicists, who usually study geophysics, physics, or one of the earth
sciences at the graduate level, complete investigations across a wide range of
scientific disciplines. The term geophysics classically refers to solid
earth applications: Earth's shape; its gravitational, magnetic fields, and
electromagnetic fields ; its internal structure and composition; its dynamics
and their surface expression in plate tectonics, the generation of magmas,
volcanism and rock formation.