Given that a region has an average annual air temperature of 13°C, what would the subsurface temperature be at a depth of 2 km? Assume the geothermal gradient is the same as the world average geothermal gradient, which is approximately 30°C per kilometer.
A. 80°C
B. 93°C
C. 60°C
D. 73°C
Answer: D
Environmental & Atmospheric Sciences
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