Question: Which principle is primarily used in the 'Electrical Resistivity' method of geophysical surveying for site investigation? A ) The variation in magnetic susceptibility of different

Which principle is primarily used in the 'Electrical Resistivity' method of geophysical surveying for site investigation?
A) The variation in magnetic susceptibility of different materials
B) The resistivity differences in soil and rock substrata to electric current
C) The radioactive decay of geological formations
D) The acoustic impedance differences in subsurface materials

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