Rath said:
Oceania isn't really a continent to be honest. Australia is a continent in its own right and New Zealand is certainly not attached to it in any way other than proximity. As I said NZ is actually literally on a continent 'Zealandia' if you want to get pedantic and Britain isn't part of Europe. Basically Islands seem to get attached the nearest continent to them in describing the continents even though they don't always share a physical relation with them.
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Politically NZ is part of Oceania (I am not certain but I think Australasia is only Aus, NZ and the islands North towards Asia, wheras Oceania includes the Pacific islands as well)
Geographically you have to start talking about either borders with the sea, or continental crust. Using the Former then yes you are correct NZ is a seperate "continent" in the same way that every island is therefore a seperate continent.
If you use the difference between continental and Oceanic Crust, then there are only really 2 continents (those being Antarctica and everything else, I think New Zealand may not even be counted in this, and therefore would become 2 of the largest islands in the world along with Iceland)
There is no set definition geographically for the continents, which is why people use the political version with 7 continents.