So I'm writing a story where two parallel earths end up fusing together and are becoming one and through some sort of "magic" they don't end up destroyed. So let's say that on the one earth its intelligent inhabitants know that this would occur and have been subtly seeding the other earth for thousands of years so that their species would survive. Now both earths are nearly identical except that one is 20% larger and is 65% water, 20% land and 15% ice, while the other earth is similar to ours. Where there are cities on earth there is nothing on the other and vice versa. Continents would have their land mass increased while nearly all oceans, lakes, rivers and seas dramatically increase in size and depth.
As a commenter said excess land masses are converted into either fuel for the planet core or "energy" that would be used to cool the planet as well as repair any damage to the ozone. Now in this verse that I'm trying create magic is a universal force that is constantly growing and is like an evolutionary medium that alters nearly all living organisms to the point that they can tap into its power. Amalgamation is an event that happens in this verse nearly every ten thousand years and any world that is caught in the middle of this event is enveloped in a blinding light that lasts for hours while its fusion occurs.
Inhabitants of either world are seemingly frozen in place while this happens. I can't really form a question for this, but I would simply like a review. I like to think that this is a reality and world fusion, but I am not entirely sure.