Geoelectrics is made from two words i.e. Geo & Electrics which means the natural electric fields and electric currents of the Earth. The theory of geoelectricity is still not clearly defined by geophysicists. Although it is supposed that geoelectricity is due to the natural fresh/saline water, conductive mineral grains and clay particles.
Geoelectrics is one of the classic method of geophysics. Especially in groundwater exploration, geoelectric profiling & soundings still play an important role. This is usually done as sounding, i. e. first of all vertical changes of electrical conductivity in the underground are studied. There are, however, also electrode arrays that work more in a mapping way, which means they yield more information on the lateral changes.