No one on this earth KNOWS what the center of the earth is made of, because no one except God has reached the center of the earth.
No one but God KNOWS how big the center material of the earth is because NO ONE HAS EVER DRILLED THAT FAR!

Now, stop using baseless evolutionary theories taught in schools!
LOL
None of those THEORIES have ever been proven!
All those theories are completely baseless and unproven.
But, as I have said before, the power and belief system of evolution is so well guarded that governments and corporations are spending billions of dollars just to try to prove the Holy Bible is false!
But, their evolutionary theories are failing and falling apart, and these so called scientists hope more than anything that they can prove life exists outside of this planet.
Then, they will lie and say that there is life on other planets, and that THAT life is where we came from.

Go teach your evolutionary crap somewhere else, because I will keep on defending the Truth of Jesus Christ!