Re: [iPad] SFO Quake

 

There was a doco I watched a few years back, we need the moon to survive. I will watch again, but here is what I remember
 
As Jim said, the moon stabilises our rotation. Otherwise the earth would wobble significantly and cause marked global weather shifts, causing vegetation to thrive, then die in freezing ice ages. Animals would starve as the food chain failed to adapt in time. I recall that the tidal effect of the moon and the stable ice caps gives us the(cannot recall the exact term) The Great Blue Conveyor. This is the water flow around the earth. Moving water around and distributing nutrients is key. Otherwise the water stagnates. Simplistically, the major currents move around the earth, hit the poles, sink, then warm up and move towards the surface as the temps rise. If the moon effect on tide was not there and as the wobble quickly changes the rotation so that the poles moved, the water flow around the earth would stop. Or become extremely inefficient
 
   

From: "Jim Saklad jimdoc@icloud.com [iPad]" <iPad@yahoogroups.com>
To: iPad@yahoogroups.com
Sent: Friday, 29 August 2014 11:07 AM
Subject: Re: [iPad] SFO Quake

>> 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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Posted by: Tony <tdale@xtra.co.nz>
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