Discussion
At a geothermal gradient of 30 degrees per kilometre and a surface temperature of 20 degrees, the rock temperature at 2 km is about
Answer: B
Correct answer: 80 degrees
\[ T = 20 + 30 \times 2 = 80\ \mathrm{^\circ C}. \] A straightforward calculation with a real consequence: a tunnel at this depth will have a rock face at 80 degrees, which is above what people can work in without ventilation and cooling.
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