The document discusses evidence that supports the theory of continental drift proposed by Alfred Wegener in 1915. Some of the key evidence includes: 1) The fit of the continents' coastlines and continental shelves suggests the continents were once joined together. 2) Glacial deposits and fossils found in regions that are now tropical provide evidence these areas were once farther from the equator when the continents were in different positions. 3) Certain fossil types found across continents that are now separated by oceans could not have crossed the oceans, indicating the land was once joined.