Alfred Wegner came up with the theory of continental drift. According to the theory, the world was made up of a single continent (Pangea). That continent eventually separated and drifted apart, forming into the seven continents we have today. Wegener stated that the continents are not rigidly fixed but are slowly moving—at a rate of about one yard per century.
Similar plant and animal fossils are found around the shores of different continents (e.g. Mesosaurus)