Why are geological processes like plate tectonics considered vital for long-term habitability, even for a planet perfectly situated in the HZ?
Answer
It acts as a global thermostat by cycling carbon dioxide between the atmosphere and interior.
Plate tectonics helps maintain long-term climate stability by cycling carbon dioxide through volcanism and subduction, preventing global temperatures from plummeting if the gas were permanently locked in rocks.

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What Is the Habitable Zone? - YouTube
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