Here's a breakdown:
* The Earth's Structure: The Earth has three main layers: the crust, the mantle, and the core. The crust is the outermost, rigid layer, and it's divided into tectonic plates. The mantle is a hot, semi-solid layer beneath the crust.
* Convection Currents: Heat from the Earth's core causes the mantle to circulate in a process called convection. Hotter, less dense material rises, while cooler, denser material sinks. These currents create a "flow" within the mantle.
* Plate Movement: The tectonic plates, which sit on top of the mantle, are dragged along by the convection currents. The movement is slow, only a few centimeters per year, but over millions of years, it can cause significant changes to the Earth's surface.
So, instead of riding on something, the tectonic plates are pulled and pushed by the movement of the mantle beneath them.
