A reader writes:
“I always thought that large land bodies that are joined in some way to each other is the reason they are called continents. Like the way North and South American are connected and Europe, Asia and Africa are also connected. I thought that is why there are only five rings on the Olympic flag. Each ring represents a continent and the World has only five. All the other land bodies are islands.”
This is not a definitively resolvable issue.
There are seven continents, or six, with the debate being whether the Americas are one or two. Europeans somewhat dubiously call them one. Geologically and biologically, they are two.
Australia is widely considered an island as well as a continent, but no one says that Antarctica is an island.
Connection is not part of the definition: the Americas have been continents for hundreds of millions of years, but have only been joined for a few million.
As my American Heritage Dictionary puts it, “Continent — one of the principal land masses of the earth, usually regarded as including Africa, Antarctica, Asia, Australia, Europe, North America, and South America.”
The Olympic rings are not continent-specific, though when created they represented the continents with nations competing (thus omitting Antarctica). According to an official Olympics site, “This flag translates the idea of the universality of the Olympic Movement. At least one of the colours of the rings, including the white background, can be found on the flag of every nation in the world. But watch out! It is wrong, therefore, to believe that each of the colours corresponds to a certain continent!”