Are Geologically Dead Planets Habitable?

One of the planets I'm thinking of for my book series has all of its landmass in the northernmost half of the northern hemisphere (it is thus mostly a water world) and is completely geologically dead. However, it has an Earth-like atmosphere, is roughly Earth-sized, and has an Earth-like climate (it is much further away from its star than Earth is, but its solar system has a red giant as its sun). Would the land on a planet like this be habitable long-term for humans?

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Are Geologically Dead Planets Habitable?

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