your referring to our world think about it Gaia worksdifferently to Earth it uses Lifestream so if something happens lifestream heals it pay attention to Bugenhagan on disc 1 and the Ghast/Ifalna tapes it tells you that the northern crater is where the planet concentrates most of the spiritual energy to heal the massive wound created by Jenova and the thing that looks like ice is Materia and lots of it but ive been thinking, does all materia have magical properties?
This is a video game it doesnt have to obey the laws of physics you know the laws of matter in ff7 could be a hell of alot different to ours but hey its only a video game what does it matter FF8 and FF9 have the same features even 6 and before