Electric resistance method used in investigating groundwater, minerals

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Electric resistance method used in investigating groundwater, minerals and know the layers beneath the Earth’s surface and is the first geophysical method applied in the detection of effects.
This method relies on the existence of differences in electrical resistance (Resistivity Contrast), between the archaeological object “body designed to look”, and the surrounding material, it is known that rocks vary in susceptibility of electrical conductivity, this difference depends on several reasons, including gaps, plus quality metal components of these rocks. Etc. Generally be igneous rocks (Igneous), more reluctant to electricity from sedimentary rocks (Sedimentary Rocks), to fit the gaps, and soils (Soil), terracotta (Clay), amenable to high electrical.
For the purpose of conducting field measurements to demonstrate on Earth four electrodes (Electrods), two of them used to pass electrical current and designated electrical poles (Current Electrods), the other the chiefs used to measure potential difference and labeled with voltage electrodes (Potential Electrods).
Electric resistance method used in investigating groundwater, minerals
During the screening process on the Poles are installed in two ways:
Method 1: called Wii seen (Wenner Configuration), which distributes electrodes and electrodes surrounded by Poles and be equal distances between the four poles. And choose the distance between electrodes based on depth effects to be detected and the form of anomalies