Scientists believe that about 250 million years ago, the plates were positioned so that all plates were joined together to form a super continent called Pangaea. They also thought that about 200 million years ago, the super continent Pangaea separated into 2 large continents called Laurasia and Gondwanaland. Over periods of millions of years the plates continued to collide and separate to eventually form seven continents. This plate tectonic theory became real to scientists in the 1960s when they and map makers noticed how well South America and Africa fit together, even though the continents are far apart. All seven continents are moving farther apart or closer together because of plate tectonic activity. North America and northern Asia are moving closer together, as well as South America and southern Asia, but North America and Europe are moving farther part, as well as South America and Africa. In another 100 million years or so, another super continent will form where the Pacific Ocean used to be.