What did Alfred wegener notice about the outlines of the continents?

Alfred Wegener noticed that the outlines of the continents, particularly South America and Africa, appeared to fit together like pieces of a jigsaw puzzle. This observation led him to propose the theory of continental drift, suggesting that continents were once joined together in a single landmass called Pangaea. He argued that this separation occurred over millions of years, influencing the current positions of the continents. Wegener's ideas paved the way for the development of plate tectonics, although they were initially met with skepticism.