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you're welcome.
I'd guess that a few thousand miles of volcanoes erupting underwater would warm it up some?

but wait...there's more..
also under the part of antarctic that's melting.
Last best guess is there are about 4 MILLION volcanoes on the ocean floor...kinda like...you know...Hawaii?

Hawaii is a special case...it's a 'hot spot'...not on the ocean ridge. The mid ocean ridge circles the planet like the seams of a baseball. forty THOUSAND miles...part of it's called 'the ring of fire'...

wonder why?