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I have some silly questions.
Where would underground civilizations obtain sunlight? Our core is as hot as the sun and is surrounded by iron-nickel-cobalt. (Correct me if I'm wrong).
View attachment 2915
I am assuming that civilizations wouldn't dig deeper than the crust and definitely not deeper than the mantle, but I've never seen them, so I can't say for sure. If trees supposedly live underground, where are they receiving sunlight? I'm sorry if this in the video, but it's 42 mins long. I'll be interrupted before I can view something that long.
Would enough oxygen be able to enter the holes going down there? I could imagine some really shallow civilizations in the crust as well as their using torches to light things up, but assuming there are trees under there doesn't make sense to me. Could someone explain?
Thanks.