Well, it's the radioactive decay of Iron itself deep within the earth's core that's causing the plates to move & eventually collide.

And since plates move whether oceanic or continental, then it also means that continents move a.k.a. "continental drift."

Meaning, all continents of the world has been moving [drifting] since time-immemorial (i.e. millions of years!) leading to its present-day configuration.

But if you look at the Atlantic coast of the America's, it perfectly matches the Atlantic coast of Africa & Europe like that of a jig-saw puzzle.

In fact, all of the continents are simply just one BIG jig-saw puzzle that broke-up long time ago if you look at them carefully.

Indeed, they all match each other when pieced together.