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If we look at Mars' possible geothermal gradient (see Earth's) which is about 25 °C per km. Using the low estimate of Mars's gradient to be 1/4 that of Earth's Source, that's a bit over 6° C per km. so 55 km, 330° C. Added that to Mars' average surface temperature of -55 C, you're talking 275° C or 527° F at 55 km underground, and that's a low estimate. ...


Nobody knows it. 55 km depth is probably between crust and mantle, with estimated temperatures well above 500 K.


Nasa has a atmospheric model of mars: $$0.699 *e^{-0.00009 h} $$ A naive application of this model, solving for a pressure of 101 kPa, gives a depth of -55 km. The Armstrong limit depth (at which water boils at body temperature) is -24km The model assumes constant temperature, and gravity (it doesn't correct for the fact that at 55 km below the surface ...


Try this link This should have the data you're looking for, though you may need to process it a bit to get it into a format hat will be usable.

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