Holding page for
   Pacific ****

Fig.1. The Pacific, and how it closes.  A can of worms. Antarctica at 6 o'clock, Australia at 8 o'clock, ..and North America at 2 o'clock, a big spreading ridge in between, .. and a _*whole*_*lot*_*more*. (Image courtesy of GoogleEarth).

 
 

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Worms
Spreading dynamics
Ridge sequences
(This show is not over till the fat lady sings )