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technique Word or Phrase:Magnetometer Survey  
Definition:A magnetometer survey measures the earth's magnetic field and the effects that structures in the ground may have on it. For example, walls, pits and trenches might display different levels of magnetism than the surrounding ground. These differences can affect the readings taken during the survey. Once the readings have been recorded they are plotted out to produce a plan of features that exist below the ground. See also geophysical survey.


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