Plate tectonics is the theory that Earth's outer layer is made up of plates, which have moved throughout Earth's history. The theory explains the how and why behind mountains, volcanoes ...

The Earth is made of different layers: the core, mantle and crust. Plate tectonic theory shows that the crust of the Earth is split into plates (pieces of the Earth’s crust). The movement of ...

(NewsNation) — Scientists have long wondered why the Earth has a broken, rocky surface made up of huge plates that crash into each other. A new theory says it’s connected to the Mars-sized ...