btw the way it is green would sugest that it is mainly made of copper, since when copper oxadizes and turns green (eg the Statue of Liberty)
but New Terra has a low amount of O2, so unless its made of another material that reacts with CO2 and turns green, wich wouldnt make since, because they woule be mainly made from Aluminum, Steel, and Titainium
I dont know why I thought of that through, mabe because its 1 in the morning and im bored lol