As the continents broke apart and drifted, so bits would be eroded way, other bits would also break off and may be left behind. Natural erosion would also reshape the land, and some pieces could even have turned round.
Wegener believed all continents had once been joined because of the similar shapes of coastlines, matching geological formations across continents, and evidence of past glaciation extending from multiple continents, suggesting they were once connected.
Wegener's theory was that all continents were once connected and are slowly drifting around.
Pangaea.
Yes, it is believed that all land was once connected in a single supercontinent called Pangaea. Over millions of years, the landmasses drifted apart due to tectonic plate movements, resulting in the continents we see today.
Since you see the same fossils from on continent to another, it proves that all the continents were once connected. Let's say one fossil of a small animal is found on one continent, and on another far away, such as Antarctica and Africa. It would be impossible for the small animal to swim from Antarctica to Africa or Africa to Antarctica because it is a small animal, after all. Plus, it might not be a sea animal (let's say it's not for this scenario, so that we can prove that all the continents were once connected). Therefore, you can say that they were all once connected since the fossils of this small land animal were found in Antarctica and Africa, and it would have been impossible for it to get across if the continents weren't connected. So, since the continents were connected before, this small land animal could easily walk over from Antarctica to Africa or Africa to Antarctica. This just supports the idea that all the continents were once connected. There are more facts to go into it, such as how all the continents somewhat fit together like a puzzle. Hope I helped :)
He means that all of the continents were once connected, but plates shifted and they were seperated.
The Pangaea theory is the theory that all the continents were once connected together into a single land mass.
I SAW IT in a book about the past all the continents were all hooked together but something broke it apart.
Pangea
The supercontinent Pangaea connected all the continents about 300 million years ago. Over time, Pangaea split apart, leading to the formation of the continents as we know them today.
When all the continents were connected, it was a supercontinent called Pangaea.
The fit of the continents is called continental drift, which refers to the theory that Earth's continents were once all connected in a single supercontinent called Pangaea, before breaking apart and moving to their current positions.