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Q&A Can a habitable planet have two separate crusts, both of which can sustain life?

Can a habitable planet have two separate crusts, both of which can sustain life? I am wondering if through the planet's creation, over time through some form of mantle cooling/erosion combination, ...

6 answers  ·  posted 6y ago by Son of Thrain‭  ·  last activity 6y ago by Son of Thrain‭

Question environment planets geology earth hollow-earth