How do the continents fit together to form the Earth's landmasses?

The continents fit together like puzzle pieces to form the Earth's landmasses due to the process of plate tectonics. This theory explains how the Earth's outer shell is divided into large, rigid plates that move and interact with each other. Over millions of years, these plates have shifted and collided, causing the continents to drift and eventually come together to form the landmasses we see today.