Okay let's see if there are a couple simple anologies to help explain what is about to happen.
First allow me to say this is only my personal interpatation of the material given in the Law of One.
Our planet is about to graduate into a higher awarenss field. This means the planet itself will awaken to new connections with its solar center as well as its inhabatants.
Likewise the inhabatents will be given the oppertunity to graduate to this new awareness as well.
The Ra, which are the 'narators' of the LoO, say that all life will be harvested (plucked from their naturdal enviornment) simultaniously. After we are harvested we will be checked for quality. This quality is determined by how polorized we are. And if we are of suffucent quality we graduate onto the greater awareness along with the planet itself.
We can look at it this way; there are three major parts to any living thing, the mind (thoughts), the body (emotions) and the spirit (heart). The thoughts and the emotions are the polarities sourounding the heart, when the two polarities are in balance with one another the heart can effortlessly rest in the center.
What graduation and greater awareness mean to our three part system.
Let's pretend that our two polorized parts (thoughts and emotions) are the two blades of a helicopter propeller. The two sides must be in balance with one another in order to spin properly. If one side is heaver than the other the center will wobble uncontrolably and possably distroy the entire mechinism. Furthermore the faster the blades spin the more fine tuned the balance must be. Greater awareness means faster spinning blades, and if we are not balanced enough to handle the increased speed safely, then we will not be allowed to graduate.
The people who do not pass the quality check will be allowed another slow spinnng cycle to balance themselves, unfortunetly they will need to pick a new planet to do that on because this planet will no longer support those who cannot handle the increased speed (awareness).
So to directly answer your question, no the earth will not split in two. There will be those who accelerate and remain on this earth, and those who do not will be placed on another earth seperate from this one.
Gnothi Seauton (know thyself)