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Comment by xg15

2 hours ago

> There's a seam of volcanic mountains that runs down the center of the Atlantic

Yeah, that's the pacific rim, which in some sense is the opposite of a volcano.

No the seam at the center of the Atlantic is a mid-oceanic ridge, and it’s very much like a volcano since magma comes out. Icelandic volcanology comes from it being on the ridge.

There are ridges off of the US coast (Explorer, Juan de Fuca, Gorda) but the ring of fire which surrounds the pacific is mostly subduction areas.