On a geologic map,if the contacts between sedimentary rock units form a bull's-eye pattern of concentric circles,with the oldest unit in the center,the underlying structure is a(n)____________.

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The bull's-eye pattern of concentric circles on a geologic map indicates a dome structure, where the oldest rock unit is found at the center of the dome and the layers progressively get younger towards the outer edges. This is caused by the uplift or arching of the underlying rock layers, forming a dome-like shape. Anticlines and synclines are both folds in rock layers, but they do not typically form concentric circles as seen in a dome. A basin would have the youngest rock unit in the center and progressively older units towards the outer edges. Therefore, C) dome is the best choice.

On a Geologic Map,if the Contacts Between Sedimentary Rock Units