What caused Pangaea to break apart?
The motion of tectonic plates.
Tectonic plates are the huge plates that make up the earth's crust. These plates move around and cause motion in the ground. The ocean is also an asset to the breaking of Pangaea. It rose ad cover up the land that had collapsed during the years. Matter of fact, the land is still moving to day.
Hope this helps.
Someone Please double check, not to good on this subject