Answer:
The matching of the continental margin of both Africa and South America
Step-by-step explanation:
The edges of both the continents namely Africa and South America perfectly match with one another. This was one of the key pieces of evidence that supported the theory of continental drift.
This theory says that the continents float across the vast ocean from one place to another with respect to the poles. It was initially discovered by Alfred Wegener.
This matching of the continental margin suggested that both the continents were once connected together, and were possibly a part of the large landmass, which was commonly known as super-continent 'Pangaea'.