About 300 million years ago, Earth didn’t have seven continents, but instead one massive supercontinent called Pangaea, which was surrounded by a single ocean called Panthalassa.
The explanation for Pangaea’s formation ushered in the modern theory of plate tectonics, which posits that the Earth’s outer shell is broken up into several plates that slide over Earth’s rocky shell, the mantle. (source)
So let’s get the SuperGlue.
This is a fascinating insight into the way the one land mass shifted over time to form the continents we know today, however, because the tectonic plates keep moving eventually it will end up back as one land mass again, unless we succeed in destroying the planet first.