We had the fourth anniversary the other day. But South America seems to be the home of subduction faults.
Sent from my iPhone 5S
Sent from my iPhone 5S
Fascinating how the planet can stabilize after high or low volcanic activity assisted by the recycling of the elements by tectonic plate movement.Of course, some areas are more *directly* affected by plate tectonics than others — your New Zealand, for example.It was just 9 days ago that the conversation below happened, and today I stumbled across this:
<http://nautil.us/issue/12/feedback/why-aliens-and-volcanoes-go-together>Of course, it is probably plate tectonics – and the large moon – that has made it habitable...How so, Jim?I only partially understand the orbital mechanics, but the large moon apparently stabilizes the Earth's rotation axis. If it were varying more widely, and over shorter periods, climate shifts would be more rapid and more severe, with few, if any, long stable periods for species to "mature" before they were wiped out by major climate shifts.It appears that Earth is the only planet in this system that has plate tectonics. Even our "twin" — Venus — does not. The moving crustal blocks re-cycle the lithosphere, produce very "friendly" zones at regions of sea-floor spreading (lots of nutrients any lots of energy available: this may be where life began here), and slowly, over millions of years, creates and then slowly alters or destroys refugia for life to develop in — nearly textbook circumstances for driving the evolutionary process.Volcanism is also an essential process for making some metals and minerals easily available at the surface, rather than leaving them buried under miles of crust.[I am only an educated amateur at this. I've found the processes fascinating, and have read up on them sporadically over the decades.]
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Jim Saklad mailto:jimdoc@icloud.com
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