The Temperature Changed
They had underestimated the rate at which the temperature would rise. The temperature in the hole had reached 180 degrees Celsius (356 degrees Fahrenheit) by the time they got close to the target. This is 80 degrees Celsius (176 degrees Fahrenheit) warmer than they had anticipated!
The Temperature Changed
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There Was More
That wasn’t the only difference between the two situations. The researchers also discovered that the granite at such depths was significantly thinner than previously thought. Consequently, it responded in unexpected ways when temperatures rose above a certain threshold.
There Was More
