102
Average Ground Water Temperature in the Contiguous U.S.
(sh.itjust.works)
For the map enthused!
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How is 77 degree groundwater not full of bacterial growth?
Well there's those brain eating amebas
Lack of nutrients, probably. Life needs useful energy, and the kind of life that you or me would find offensive needs a whole bunch. Therefor, by the second law of thermodynamics a closed system eventually becomes lifeless.