If you take areas where plates are separating and move them back together, and do the opposite with areas where plates are meeting, you get one big landmass. The continents even fit together!
That's a pretty abysmal induction. If I found a rock formation which I could fit my face into, would I be inclined to induce that I had been born out of a rock? (I wouldn't. You might, I don't know, but the point is, most people wouldn't, because what kind of an argument is that?)
Also, there exists fossil evidence that the continents were once joined--the fossilized remnants of the same types of animals on two separate continents. An ocean crossing would be impossible for for these creatures. (No Dinosaur-Pirates)
I challenge you to demonstrate, or at least explain why an ocean crossing would be impossible for these creatures. I very strongly disagree. Do you have any evidence to support your outlandish claims?
Oh boy, somebody's debating Pangaea. Here are a couple brief reasons why Pangaea is indisputable fact:
The magnetic poles move and swap every once in a while. When lava cools, there are little magnetic bits that get stuck aligned with the current magnetic field. Thus, if we know what the magnetic poles were doing and when a rock was formed, we can know what direction in was facing when it was created. Cool, huh? Magnetic records from Pangaea era agree perfectly with the idea that all continents were once joined. This is basic geology, you will find that any respectable source will agree with this. My source was my college geology textbook, which I don't have anymore.
Ice carves though rock when water gets inside and freezes. This makes very distinctive parts and shows where the continent got cold enough for this to happen. There are places where ice has carved through rock where water would never get that cold. The markings invariably agree with where we believe the continent was at the time the rock was carved.
Fossils have already been mentioned. We're talking identical species being oceans apart. Not just one or two skeletons- it's as if the same exact dinosaur lived in an area that covers two coastlines. Sure, it's possible that one or two dinosaurs floated across the ocean and landed (already dead), but they would not have then started reproducing- and even if they did, we would see differences, because separated sects of the same animal in very different climates would evolve differently.
Strangely enough, if we reverse the movements of the continents observed today, we see that they would eventually collide. Funny, that.
The continents fit together like puzzle pieces. You say "If I found a rock formation which I could fit my face into, would I be inclined to induce that I had been born out of a rock?" Well, the difference is, continents are made of the same materials, and we don't have any evidence saying they DIDN'T come from the same chunk. If I found a bunch of ceramic shards on my floor, and they fit together to make a bowl, it would be reasonable to assume that they were once a bowl before my cat knocked it over.