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Which geophysical method uses natural voltage differences to study subsurface

This question belongs to Geological Engineering Geophysical Methods In Engineering
Geophysical Methods in Engineering
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Which geophysical method uses natural voltage differences to study subsurface?

Answer & Solution
Correct Answer: Option A
Self-potential (SP) method measures natural electric potentials in the ground.It�s useful in detecting groundwater flow and sulfide ore bodies.
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