Continent
Continents are the things the world is made of.
Currently there are between 4 and 7 continents, it depends on how you count them.
Some pepole say america is one continent, other people think it should be seperated in north and south america.
Some people say asia and europe should be called eurasia, other people think it should not.
Some people say oceania is a continent, other people view it as a tumor of asia.