Apparently Earth is seen as a zit faced teenager by the other planets, which is why they all stay well away from that volatile youngster and its even more volatile inhabitants.
And like all good acne covered teens Earth will cleanse its surface with something that removes all the muck and burns like hell. What's it called again? Oh yeah, red hot lava.
So sayeth the drawer of Things In Squares, and so shall it be.
-Via Geeks Are Sexy