Enigmatic blue heart 🩵

There is a blue heart of the universe.  Its mind's castle is so different  from place to place. There are cool forests and deserts, the biggest tearful oceans, and highly rugged mountains, sleepy or dead or flammable devil volcanos in this castle. For the universe, it is a cool blue planet. but the inner of it is filled with the devil's flaming blood of lava. Every outer beauty hides a dark side.  So how define the earth?