The average rate at which energy is conducted outward through the ground surface in North America is 54.0mW/m2, and the average thermal conductivity of the near-surface rocks is 2.50 W/m ∙ K. Assuming a surface temperature of 10.0oC, find the temperature at a depth of 35.0 km (near the base of the crust). Ignore the heat generated by the presence of radioactive elements.