Final answer:
Earth's internal heat is the energy that fuels the tectonic system, driving plate tectonics.
Correct answer D
Step-by-step explanation:
The energy that fuels the tectonic system is Earth's internal heat.
Earth's crust and upper mantle are divided into tectonic plates that move due to slow convection of the mantle. This convection process allows heat to escape from the interior of the Earth, providing the energy that drives plate tectonics.
Additionally, the interior of the Earth still holds thermal energy from its formation and radioactive decay of elements like uranium, thorium, and potassium.
Earth's internal heat is the energy that fuels the tectonic system, driving plate tectonics.
Correct answer D