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Sorry 44 terawatts (44X 1000 gigawatts) it's nothing compared to the energy that moves tectonic plates.
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Take that up with Scientific American.
It's a summation of the residual heat left by trapped heat and radioactivity, not the energy available to move things.
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The new measurements suggest radioactive decay provides more than half of Earth's total heat, estimated at roughly 44 terawatts based on temperatures found at the bottom of deep boreholes into the planet's crust. The rest is leftover from Earth's formation or other causes yet unknown,
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There's no radioactivity at the core, apparently, because it solid iron.