Pangaea

In Earth Science, my students recently took an exam about Plate Tectonics. One of the things they had to know was what Wegener's evidences were for his theory that Pangaea existed (Pangaea was his name for a supercontinent of all the continents fitting together). One of the evidences was that fossils matched across continents. One fossil in particular that we talked about was the Mesosaurus. Fossil remains have only been found on the southeastern coast of South America and southwestern coast of Africa - where the two continents fit together. It was postulated that the fossil remains are only found there because at one time, those two coasts had to have been closer together. If the Mesosaurus had been able to swim across an ocean, then fossil remains should be in other parts of the world, but they haven't been found. Here is what one witty student wrote though in answering the question about evidences for Pangaea existence:

"Dinosaurs - I don't which dinosaur. But, they found two same fossils on different continents. Scientists doubt that it had the ability to swim across oceans so it gives strong evidence.
Sidenote: Dinosaur could HAVE HAD some awesome determination."

I love to read something funny after grading a thick pile of exams.