One of the principal difficulties in establishing the theory of continental drift (the idea that tectonic plates drift around on Earth's surface)was identifying a source of energy capable of powering such movement.What do we now believe to be the direct source of such energy?

Question

Quizplus · Accepted Answer

The direct source of energy that powers continental drift is hot material welling up from Earth's interior through convection currents in the mantle. These currents are driven by the heat generated by the radioactive decay of isotopes in the Earth's core, which creates a thermal gradient between the core and the mantle. This energy is transferred upward through the mantle, causing the tectonic plates above to move slowly over time. While the tides from the Moon and Sun can cause slight changes in the Earth's rotation and movement, they are not a significant source of energy for driving plate tectonics. The greenhouse effect traps heat near the Earth's surface, but it does not directly affect the movement of tectonic plates.

One of the Principal Difficulties in Establishing the Theory of Continental