[wredcoll]

They really aren't, there's no objective way to divide the world into exactly 7 continents (or 6) using geology.

[nextaccountic]

America, Afro-Eurasia, Australia, Antarctica

I can count 4

[wredcoll]

Based on what?

[nextaccountic]

Based on being large landmasses

Potentially any island is a continent if your cutoff is low enough