Geophysicists use the principles of physics and mathematics to study the Earth’s surface, internal structure and composition, atmosphere and magnetosphere. The many overlapping fields in Geophysics include: Earthquake Seismology, Exploration Seismology, Electromagnetic Geophysics, Gravity and Magnetic Geophysics, Geodesy, Geomagnetism as well as Geodynamics and High-Pressure Geophysics.