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Geology/plate tectonics


I'm wondering whether the mid-Atlantic Rift is the only area on the planet in which there is new crust being formed, which is helping to drive plate tectonics. What about the Pacific? It seems as though the whole Ring of Fire is subduction, but unless the Pacific Ocean is getting smaller, I have trouble seeing what's driving plate movement.

I know that magma movement is responsible for plate movement; I'm just having trouble unifying all these ideas. Can you help?

Plate Tectonics is not the final answer to all of our queries.
It conveniently explains many observed phenomena about seismicity, magmatic activity, continental configuration, bathymetric geomorphology etc. There are many planetary observations it cannot explain, may be we would have another Tectonic Model in coming years.  


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