Tolkien didn't just create a mythology; he created an entire cosmology, starting with the creation of his imaginary world.  Many events in Tolkien's stories changed the shape of the world as well, and in this video I explain the creation story and the major world-changing events in Tolkien's legendarium.    

For more on the island of Numenor and its sinking, check out this video: https://www.youtube.com/watch?v=gqDslbXjg70

Intro and outro music from the official soundtrack, copyright New Line Tunes (ASCAP) 2001.