When we observe the world around us most of the land is mountains and inhospitable places
but when we look closer we can see that these so called mountains have evidence of bricks and structure fused into them and when we look closer we can see a mass of melting because these mountains often show us clues of flowing dripping runny formations and then we discover meltology just like lava bricks can melt at high temperatures producing these massive melted mounds
This leads me to believe most of the earth floor must have been covered in these buildings because of the masses of mountain ranges throughout the realm and something happened to make it overheat so much that it melted