Answer:
B. The inner core
Explanation:
The inner core is the innermost layer of our planet. It is so dense because it is under the pressure of all the other layers. It releases radiogenic heat into the outer core, which then passes it into the mantle, where it creates convection currents. Convection currents are responsible for tectonic plate movement and seafloor spreading, and therefore, the movement of continents over time.
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