Here's a breakdown:

* Earth's Structure: The Earth is made up of several layers, including the crust (the outermost layer), the mantle (a thick layer of hot, semi-solid rock), and the core (the inner and outer core).

* Mantle Convection: The Earth's mantle is constantly moving due to heat from the core. Hotter, less dense material rises, while cooler, denser material sinks. This creates convection currents within the mantle.

* Plate Movement: The Earth's crust is broken into large pieces called tectonic plates. These plates "float" on the mantle and are dragged along by the convection currents. The movement of the plates is slow, typically a few centimeters per year, but over millions of years, it can lead to dramatic changes in the Earth's surface, such as mountain ranges, volcanoes, and earthquakes.

In summary, the heat from Earth's core drives convection currents in the mantle, which in turn cause the tectonic plates to move.