Definition per wikipedia:
Seven Continents: Africa, Antarctica, Asia, Oceania, Europe, North America, and South America.
Six Continents: Africa, Antarctica,Oceania, Eurasia, North America, and South America.
Six Continents: Africa, America, Antarctica, Asia, Oceania, and Europe.
Five Continents: Africa, America, Australasia (Oceania), Antarctica, Eurasia.
Five Continents: Africa, America, Oceania, Europe, Asia.
Four Continents: America,Oceania, Antarctica, Eurafrasia.