In fact, the answer to this question is unequivocal, and there are 5 popular models.
7 continents: Africa, Antarctica, Asia, Australia/Oceania, Europe, North America, South America. Most popularly accepted model, commonly taught in English-speaking countries, China, India, and Pakistan.
6 continents version 1 (Asia and Europe united): Africa, Antarctica, Australia/Oceania, Eurasia, North America, South America. The model is most commonly taught in Western Europe.
6 continents version 2 in (one big America): Africa, Antarctica, Asia, Australia/Oceania, Europe, America. This model is popular in Eastern Europe and Japan.