The first one is a scene with the base animation of continents and meridians. See the animation preview. You can modify or edit the animation or create it from the scratch by deleting all animation keys at first.
The second file is a scene wich has a few cameras with different angles of view on the globe. The scene doesn't have any animation keys so that if you need it you can easily change a length and width of meridians by using modifers.
The third file is just a scene with polygonal model only. Without animation.