Exercise potential temperature

Calculate the temperature in the Earth's upper mantle as a function of depth from 0 to 300 km from its potential temperature of 1280°C as determined from the volume and composition of MOR basalts. Use the equation on overhead #49 and the values provided in the handouts. Plot the calculated temperatures as a function of depth (z).
What is the mantle temperature in 150 km depth if the mantle potential temperature is 1280°C?

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