Answer: Fossils, rocks, and shapes of continents.
Explanation: Fossils of similar organisms across widely disparate continents encouraged the revolutionary theory of continental drift. Continental drift describes one of the earliest ways geologists thought continents moved over time. One fossil found on a South American Coast facing the Atlantic was the same fossil found on the African Coast facing the Atlantic. The two coasts also shared the same rock layers and rock materials.
In the image, the brown represents similar rocks and the grey is fossils.
It also looks like Africa could wrap around the point of South America that faces Africa.