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) ____________. 
Definitions:
Stock's Price
The current market value at which a share of a particular stock can be bought or sold.
Black-Scholes Formula
A mathematical model developed for pricing options, estimating the variation over time of financial instruments.
Risk-free Interest Rate
The return on investment with no risk of financial loss, typically represented by government bonds.
Stock Price Volatility
This term describes the degree of variation of a trading price series over time as measured by the standard deviation of returns.
Q7: A joint always occurs as a single,isolated
Q14: If magma did not move up from
Q25: Rocks resulting from thermal (contact)metamorphism will not
Q37: Aluminum is made by processing material excavated
Q41: A dry well will always result whenever
Q45: Presented with an outcrop containing a succession
Q47: Beneath a blanket of sediments,oceanic crust is
Q52: All the water in rivers and streams
Q54: It is unusual for _ to carry
Q70: Shale,salt,and fine-grained limestone that are unfractured are