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Q&A How to have habitable hollows on a planet

In the world that I am making there are hollows all over the planet, which are massive underground subterranean areas of the planet. Think The Hollow of the Gears Of War series. So far the going th...

1 answer  ·  posted 5y ago by anthony gutierrez‭  ·  last activity 5y ago by anthony gutierrez‭

Question earth-like climate reality-check earth alternate-earth