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A supercontinent is a giant landmass made up of many or all continents.
He proposed this because if you assume the continents are moving, then continents would be colliding and pulling apart.
The Northern part was named Laurasia and contained the future continents of North America, Europe and Asia.
The Southern part was named Gondwana and was made of landmasses that became South America, Africa, India, Australia and Antarctica.
These tectonic plates are the pieces of the crust that move around on the earth, pushing together, pulling apart and sliding past each other - and those movements are known as plate tectonics.
Many scientists believe that there have been several supercontinents before Pangaea, and there probably will continue to be supercontinents in the far future.
In 1911, a German meteorologist named Alfred Wegener began looking for additional evidence to support the idea that the continents might actually move around on the earth's surface.
He discovered many scientific papers that described puzzling data that did not seem to fit the accepted model of stationary continents.
In the current model of stationary earth surface, this data did not make much sense because there was no theory that adequately explained how continents separated by great distances and vast oceans could produce these similarities.
Over time, continents drifted, or broke apart slowly.
Scientists believe that one of the first splits created a Northern part and Southern part.
As they separated, the shorelines and boundaries were created, forming their telltale shape that led people to originally hypothesize their unity.
As in this sequence of pictures, the continents split apart and moved to their current location.
In 1927, his proposed supercontinent was named Pangaea, which means 'whole earth', and scientists still believe that Pangaea was the most recent supercontinent in the earth's history, existing about 225 million years ago.