this post was submitted on 13 Apr 2026
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No. A volcano is a vent or fissure in a planetary crust. The volcano itself is a geologigal structure and integral part of the north american plate.
A hotspot is what lies under that volcano and thereby under the north american plate.
However, those areas are not reachable by submarine (or any human vehicle at this point in time or the past). And that was the original commenter's point. There is no "under a continent" for a submarine.
When I was younger I used to interpret plate tectonics as meaning all land masses floated on top of the oceans (water). But it's closer to they all float on liquid hot magma.