As my comment is one of the ones you call out, I'll write a few words. I'm perfectly clear on the significance of Zealandia, and I find it potentially very inte

As my comment is one of the ones you call out, I'll write a few words. I'm perfectly clear on the significance of Zealandia, and I find it potentially very interesting. That said, there is plenty of continental crust that is under water. Zealandia is a particularly large and reasonably isolated piece of submerged continental crust. To me, however, that does not make it a continent; it makes it a particularly large and reasonably isolated piece of submerged continental crust. Semantics? Yes, absolutely, that is semantics, and not terribly important, but sometimes, I get irked by semantics. :)