Answer:
Coastlines
Step-by-step explanation:
When we look at the continents as they currently exist in the world, we might notice that some coastlines that are on opposite ends of an ocean match each other. This observation is what led Wegener to first began to think about the idea of continental drift. Continental drift refers to the slow movement of the continents on the surface of the Earth over time. This phenomenon is responsible for the current position of our continents.