IIRC life on a planet would not be possible without seismic activity. Some key element cycles (phosphorus? nitrogen? Not sure) depend on it?
which ones need seismic activity? Can't find the book where I first read about this
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oh & carbon too! i believe seismic activity replenishes and/or recycles all https://en.wikipedia.org/wiki/CHON
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even though can get some elsewhere too like asteroid collisions
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