Question

A disadvantage of some geophysical techniques based on magnetism is that their use in urban areas may be subject to distortion resulting from power lines and metals in the immediate vicinity. One method that can be used in such areas relies on soil moisture and is known as
a) proton precession magnetometry
b) ground penetrating radar (GPR)
c) fluxgate magnetometry
d) electrical resistivity
e) metal detectors

Answer

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