Geophysics is a scientific discipline that applies physics principles to the study of the Earth, investigating the planet's physical properties and internal structure. Techniques employed include measuring variations in the gravitational field, analyzing Earth's magnetic field, and interpreting seismic wave propagation through subsurface materials. By analyzing these physical measurements, geophysicists derive information regarding the composition, density, and movement of the crust, mantle, and core. This field is crucial for understanding global processes such as plate tectonics, volcanic activity, and the Earth's dynamic evolution over geological timescales.