The 7 continents?

Growing up in Mexico we were taught that there are 5 continents: America, Africa, Asia, Europa, and Oceania. Everybody knew that. That knowledge seemed to be validated by the fact that there are 5 Olympic rings.

In the US, however, children are taught that there are 7 continents. I am not really sure where they got those two extra ones, but since I live here I guess I have to accept it for what it is, even though it seems so wrong to me. This is probably not going to be the last time my girls learn something different or maybe even opposite to what I learned as a kid.