The Summoner separated the world for one reason, we still don't know what that was. But there was millions of blocks so that would of had to be one powerful blast. All the blocks in Skyland are Different and not just larger or smaller, but they are different places of the earth like ancient temples, cities, arenas and exile lands like the Vandegaard block. There is also peaceful blocks like: Puerto Angel, Babylonia and Temuera.