Describe the physical characteristics of geological materials that determine their electrical resistivity. 2. (10 pts) Distinguish the geological situations for which the following forms of surveying are most appropriate: VES, profiling, electrical imaging. 3. [10 pts] Explain why are four electrodes used in electrical surveying and not two? 4. [10 pts] In modelling VES results, what assumptions are normally made about the subsurface?

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