On a geologic map,if the contacts between sedimentary rock units form a bull's-eye pattern of concentric circles,with the youngest unit in the center,the underlying structure is a(n) ________. 
Definitions:
Stanley Milgram
A psychologist famous for his experiments on obedience, demonstrating that people are willing to obey authority figures even when it involves harming others.
Obedience Study
A series of experiments conducted by Stanley Milgram, measuring the willingness of study participants to obey an authority figure who instructed them to perform acts conflicting with their personal conscience.
Voltage Markings
Indicators or measurements that represent the electric potential difference between two points in an electrical circuit.
Replications
The process of repeating a study or experiment to verify its results and ensure its reliability and validity.
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