It's very hard to define a continent, and depending on your choice of nomenclature, there can be anywhere between 4 and 7 continents (as summarised quite nicely in this video). If one is looking for a more rigorous definition, geologists have proposed various alternative schemes, often based on tectonic plates, or cratons - sections of old and stable rock, or the general thickness of the crust. By some of these definitions, New Zealand, a country which often gets forgotten, receives the honour of having its own continent: Zealandia.
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