Pangaea was a supercontinent formed 350 million years ago consisting of al the current land masses squashed together on one side of the globe shown right.

The land masses started to break up 200 million years ago for some reason and ‘drifted’ around the globe before settling into into their current positions Wikipedia

Dr. .James Maslow disagrees with this somewhat, claiming that a more likely model is that of a much smaller Earth, almost covered with land, which over time has expanded somehow, causing the land mass to break up and form the separate continents that we see today.

In this video he shows that this hypothesis is consistent with the geometry of the Earth, with geological evidence and with modern satellite measurements.

The picture right shows the present day geological structure of the Earth with the yellow and green stripes in the ocean floors representing the youngest rocks on the planet and the pink and white land masses being the oldest rocks.
So the centre of the Earth has expanded, causing molten lava to flow from cracks along the ocean floor, splitting apart the continents.

Modern satellite data has confirmed that the Earth is expanding today at a rate of 18mm per year.
Maslow hypothesises that the increase in mass is caused by electrons, protons and neutrinos from the Solar Wind making their way into the centre of the Earth and being converted somehow into solid matter and leading to expansion of the core.