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further thought
Ruben,
Regarding the Pacific Ocean seams -- these are topographic ridges transverse to the highly active spreading centers, aka mid-ocean ridge, where new crust burbles to the surface.
But unlike the highly active mid-ocean ridge, the transverse ridges are "cold." That is, no slippage, no active faulting. So, unlike the seams near Antarctica, it is okay to glue these seams up solid.
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