Question: Measurements in mines and boreholes indicate that Earth's interior temperature increases with depth at the average rate of 30 C/km. Assuming a surface temperature of

Measurements in mines and boreholes indicate that Earth's interior temperature increases with depth at the average rate of 30 C°/km. Assuming a surface temperature of 10°C, at what depth does iron cease to be ferromagnetic? (The Curie temperature of iron varies very little with pressure.)

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