* The Earth's crust is made up of tectonic plates. Think of them like giant puzzle pieces that fit together and move around.

* These plates are not just the surface, they extend deep into the Earth's mantle. The mantle is a layer of hot, semi-solid rock beneath the crust.

* The movement of these plates is called plate tectonics. This movement is what causes earthquakes, volcanic eruptions, and the formation of mountains.

So, the answer is yes, the Earth's crust is made of tectonic plates, but they're much more than just the surface.