You're on the right track! The different temperatures of Earth's core and mantle are a major driving force behind the formation of convection currents. Here's how it works:

* Heat Source: The Earth's core is incredibly hot, primarily due to the decay of radioactive elements. This heat is constantly transferred to the mantle above.

* Mantle Convection: The hotter, less dense material in the lower mantle rises, while cooler, denser material sinks. This creates a circular flow called convection currents. Think of a pot of boiling water, where the hotter water rises and the cooler water sinks.

* Plate Tectonics: The movement of these convection currents drags the Earth's tectonic plates, which sit on the upper part of the mantle, along with them. This movement is the driving force behind many geological phenomena like earthquakes, volcanoes, and mountain formation.

In summary:

* Temperature Differences: The core's heat creates a temperature gradient within the mantle.

* Convection Currents: This gradient drives the flow of convection currents in the mantle.

* Plate Movement: Convection currents drag the tectonic plates, leading to geological events.

Let me know if you'd like more details on any of these points!