I want to know the answer to the following question:
Along with potassium-40 and uranium, the decay of what element is a primary heat source driving plate tectonics?
All the background I'm provided with is that "The decay of uranium, thorium, and potassium-40 in the Earth's mantle is thought to be the main source of heat that keeps the outer core liquid and drives mantle convection, which in turn drives plate tectonics.". Is that enough to answer the question?