geology help- geothermal gradient

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eifos
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#1
Report Thread starter 2 years ago
#1
how do you calculate a geothermal gradient when you aren't given a graph?

I get given the change in temperature 250 °c and the change in depth 20km .

the answer is in °c km -1

help me please.
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Headingtonian
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#2
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#2
A geothermal gradient is the change in temperature per change in depth. This is the equivalent of taking the gradient on a graph where temperature is on the y-axis, and depth on the x-axis. From the units you give for the answer, you know that you want to find how many degrees the temperature changes per km of depth increase.

So for a different question where the temperature changes 400˚c in 100 km, you work out the geothermal gradient by dividing the total temperature change (400) by the total depth change (100) to get a geothermal gradient of 4˚c/km. Can you now get to your final answer?
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eifos
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#3
Report Thread starter 2 years ago
#3
Thank you so much you are a life saver.
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