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:
Marshall McLuhan
A Canadian philosopher and communication theorist best known for coining the expression "the medium is the message" and for his studies on media theory.
Media Endorsement
The support or approval of a product, service, or idea by a recognized media outlet, often influencing public opinion and behavior.
Capitalism
An economic system in which trade, industries, and the means of production are largely or entirely privately owned and operated for profit.
Elite Control
The dominance or significant influence exerted by the elite or ruling class in directing the political, economic, or social affairs of a society.
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