I don't know it's hard to believe, what's causing it anyway?
The real answer is that we don't fully understand yet.
But it's wildly expected that it is the divine energy of the gods.
It's not only rocks that turn.
The whole world is effected.
Animals, trees, humans..
You name it.
For us humanoids it can be easy to trace once ancestry.
Take my hair for example green indicates I have ancestors hailing from the southern continent of Floosha.
Just like the beautiful green eyes you and your father share.
oh dear, ahum.