If australia is "land down under", what do you call europe and antarctica?

Question

australia - land down under

asia - cradle of civilization

africa - dark continent

north && south america - twin continents

europe - ???

antarctica - ???

......and oh, why is africa called "dark" continent?

Answer 1

I call them Europe and Antarctica.

<<......and oh, why is africa called "dark" continent?>>

To Europeans it was dark, as in unknown, and many people there have a darker skin colour.  The first of those is more usually cited, but I'd imagine the second played a role as well.