A geologist is a contributor to the science of geology, studying the physical structure and processes of the Earth and planets of the solar system (see planetary geology). Training / Schooling Their graduate training typically includes significant coursework in physics, mathematics, chemistry and possibly biology, in addition to classes offered through the geology department; historical and physical geology, igneous and metamorphic petrology and petrography, hydrogeology, sedimentology, mineral… (More on Geologist)