Map of the age of the sea floor made from data about changes in the magnetic field.

Geophysics (/dʒiːoʊfɪzɪks/) is the physics of the Earth and its environment in space. It is also the study of the Earth by measuring things and collecting data. Sometimes geophysics means only studying the geology of the earth such as its shape, gravitational and magnetic field, internal structure and composition. It is can also mean how those create plate tectonics, magmas, volcanism and rock formation.