Supposedly the earth is made of layers formed from volcanic processes deep in the earth. Supposedly we have billions of years of these layers built one upon another. Supposedly this layering is global. Supposedly this magma keeps pouring out forming concentric shells, yet the earth is not hollow by now? Just how many layers can successfully be deposited without the same amount of matter being subducted, yet the layering does not allow for subduction on that scale. The new material is not from subduction of existing material. It is from the process which forms stars and planets, Birkeland Currents confining in z-pinches which draws the plasma in from its environs. There exists enough plasma in our vicinity to power the aurora and Van Allen radiation belts.

[link to www.nasa.gov]

And likewise to account for the mass increase over the eons which enabled the size of the dinosaurs when the earth had less mass than it does now. As it now has less mass then it will over the next few billion more years. Do you actually believe that the star and planet forming process ever really stops? The universe is filled with plasma. So much so that it blocks 70% of edge on galaxies already 50% less bright because of all that dust and plasma.

[link to www.space.com]