Dear Louis,
Does this mean that when we align with Galactic center all the volcano's will go off. Is that what you think would happen?
The short answer is I do not know for sure what will happen during the alignment from an Earth perspective - no information is being made available. The focus is very much on not being around when or if something of this type happens.
The Energy effect of galactic centre is massive. The Energy will affect Earth directly and in particular the Sun which is in many ways even more dangerous, but it is pointless speculating.
Of course nothing may happen, and 21 December 2012 may just be a convenient and iconic symbol for the greater ongoing event which could extend a couple of decades either side of that date.
If Yellowstone "goes off" it will be a mass extinction event on this lower version of Earth. Not just Yellowstone, there is also Mount Toba and others.
If Earth stops spinning, and then starts spinning the other way, as has happened before, there will first be massive global tsunamis due to the sheer dynamics of water changing direction - like moving in a bath tub, and then all the tectonic plates will start to move in the opposite direction again with unknown consequences. The mid-USA used to be all ocean - which is why it is very flat - before both sides came together - they would start to separate again probably resulting in the reappearance of the central sea.
As I said though - the objective is for as much of humanity as possible to transition to the higher Vibratory Frequency Earth, where all is peace, harmony and conscious connectedness with Source, where no one will have any idea what happened on "lower Earth".
So the focus is firmly on Enlightenment and "Ascension" in the truest sense, not the theological sense.
In Love and Light,
Adrian.