Quote:
Originally Posted by transreality
Is there a timescale over which a planet which is just under the limit for mobile plate tectonics will become no longer geologically active?
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You mean, active plate-tectonic-wise, right? Obviously, smaller objects can be geologically (volcanically active)
Quote:
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If earth had might have been slightly smaller it may have already become inactive. Now, is continuing geologic activity required to maintain the biosphere?
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Over what timescale? I would doubt that anyone would say that volcanoes are necessary to maintain the biosphere right now, for a long time into the future. Eventually, things would get worn down to a flat terrain and it would get rough
