How do we define a continent?

How many continents are there? If I asked you this question, you would answer: "There are five continents: America, Europe, Asia, Africa and Oceania." Of course, someone could say that he heard that Antarctica was also a continent and that would bring the count to six.
And if instead I ask what is a continent? In other words, I ask you for the definition of a continent. Could you give me an answer? Maybe yes, maybe no.
At this point the matter gets complicated. It is not easy to define a continent, in fact there are discrepancies in this regard and the definition is not precise.

If you want to learn more about the continents, download the notes below.

You can also download the abstract of the book to see more interesting things!