The geologists define efficiency as how quickly rocks reach the required depth and conditions for metamorphism. In their model, they assume that rocks must usually be buried to a depth of at least 3km to become metamorphic; however, their model also uses different temperatures and pressures at different locations, so the depth at which metamorphosis occurs can vary. Which region is likely experiencing the most efficient transformation of surface rocks into metamorphic rocks?
Answer
A
All three regions are equally efficient because they all produce metamorphic rock.
B
Region Z is the most efficient because it forms metamorphic rocks in the least time.
C
Region X is the most efficient because it has the fastest burial rate.
D
Region Y is the most efficient because it reaches a depth of 3 km in the longest time.
Explanation
Efficiency is defined by how quickly rocks reach the depth and conditions needed for metamorphism, not simply by how fast they are buried. Region Z is described as forming metamorphic rocks in the least time, so it transforms surface rocks most efficiently. A fast burial rate alone does not establish efficiency when the required conditions can vary by location.
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