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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here are a couple reference articles that may help http://theconversation.com/how-the-air-we-breathe-was-created-by-earths-tectonic-plates-33278 … http://www.astrobio.net/news-exclusive/plate-tectonics-could-be-essential-for-life/ …
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