On a geologic map,if the contacts between sedimentary rock units form a series of parallel lines,with the youngest unit in the center,the underlying structure is a(n) ____________. 
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The action of explaining or detailing the signs and indicators of a condition or disease.
American Psychiatric Association
A professional organization of psychiatrists dedicated to ensuring humane care and effective treatment for all persons with mental disorders.
Extensive Training
A comprehensive and in-depth approach to skill development, often involving several stages and methods to ensure competency.
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Describes concepts, ideas, or physical objects that are challenging to understand, hold, or deal with.
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