There is a common sentence that means that something is widely spread (a piece of information, a knowledge, a belief... a virus) or somebody has traveled a lot: across all five continents.
Therefore, and taking into account what I was taught when I was a child, I remember Europe, Asia, Africa, America and Oceania. However, in my country we often refer to America as two continents: South and North (sorry, friends from Central America).
And regarding Eurasia, what is Europe but just a tiny apendix of Asia?
Anyway, it was easiest when we were Pangea.
Good luck with your thread, I think it would be worth knowing diferent approaches to this topic.