Curiosity about the history and development of the earth is the drive for geophysicists. You observe, wonder and wish to understand what it happening, developing and testing hypotheses in search for solutions and simplifications. Using mathematics and physics as tools helps you understand the geology, and what is happening in and on earth.
Geophysical knowledge is used to understand a number of complex phenomena: earthquakes, volcanic eruptions, continental drift, and climate changes are just a few examples. It also helps us in exploring for, and finding, minerals and hydrocarbons. A wide range of techniques are used, like seismics, electrical resistivity, induced polarization, magnetometry, graviometry, georadars, and electromagnetism.