Add mid level of gleba soil.
Mods introducing new content into the game.
Furnaces, assembling machines, production chains.
Maybe add nuclear ground to the list of tiles that can be replaced with overgrown soil?
Problem of nuclear-ground is that it can be placed on any planet
hmmm, than same problem will be applied to placable waterfill like https://mods.factorio.com/mod/RitnWaterfill
I have suggested add surface condition to tileprototype, but they decided not to :<
