Frequently, geophysical methods can be useful to those without detailed knowledge of physics: buried conducting objects can be found by a beachcomber using only a crude metal detector, conducting ore bodies can be located with an EM instrument, distinct basement units can be mapped on an aeromagnetic map as magnetic terrains, and salt domes are apparent on gravity maps of the Gulf Coast. In all of these cases, anomalous values of some measurement stand out distinctly against their background values. However, this is not the case with ground gravity surveys in areas of high topographic relief where elevation corrections can be far greater than the target anomalies.

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