What is the Pangaea theory?

The Pangaea theory is one that states that all present continents were once together and collectively known as a 'supercontinent' called a Pangaea. The Word 'Pangaea' means 'all lands' in Greek, accurately defining the way the continents were 200 millions years ago before it split up. These split-up pieces drifted slowly apart and became the way they are today. Even until now, the shape of the Earth surface is still changing, and it will be forever, as long as the mantle underneath the Earth's crust gets heated and convection currents in the magma keeps dragging the plates.

The Pangaea theory was treated with much skepticsm when it was first raised. But since then, there have been much evidence to support this theory.
The Pangaea theory is the theory that once all the continents consisted of one large super-continent called Pangaea and that there was one massive ocean called the Panthalassa Ocean.