I believe this is asking what continents formed Pangea if that's correct then they're North and South American, Africa, and Europe.
Answer:
The boundaries where the tectonic plates meet are the areas of the world with the most violent natural earthquake activity. When the plates grind against each other along plate boundaries, the rocks are under so much pressure that sometimes they heat up and fold, creating mountain ranges, hills and valleys.
They are both circles or sphere
