Answer:
The best answer to the question: When Pangea split up what happened to the western edge of the North American continent, would be: vast valleys were formed between the divinding Northwestern Africa and North America and these valleys were filled with ocean water from the old Panthalassa ocean, to form the central Atlantic Ocean.
Explanation:
With the use of the tectonic plate theory scientist today know that over 200 million years ago there was one mega continent known as Pangea, and a huge ocean that surrounded it known as Panthalassa. However, this super continent began to break apart around 180 million years ago, explained by the tectonic plate theory, and this break up, especially between the earlier joined northwestern side of Africa and North America created a series of coastal valleys that were filled with the water from Panthalassa and created the central Atlantic Ocean. Changes continued throughout the centuries, and even today changes are still taking place due to the movement of tectonic plates.
