Sea Floor Spreading and Continental Drift

All of the information we have about this topic is second hand, or not directly discovered. The most know evidence can be found on a world map, as an opinion to most people it looks like the continents could fit together. The second source of second-hand information comes from the ground, fossils. Not only were fossils of the same animal found on different continents, but fish fossils wer found on mountains and tropical plants were found in the freezing Antartica. The last two pieces of evidense go together and support each other, magnetic reversals and radiometric dating. At the spot that the sea floor speads a part magma spills out and quickly forms a magnetic rock, normaly basalt. With radiometric dating we can see that the world's magnetic poles, north and south, were not always in the same spots. See as the rocks form they take the same type of magnetic field as their closes pole, but thousands of years ago rocks were found and had apposite magnetic attractions. This means there was a magnetic reversal caused by movement of the poles.