The main point or central idea that a writer states and then endeavors to prove is called a

I think the correct term to fill in the blank would be "thesis". The main point or central idea that a writer states and then endeavors to prove is called a thesis. It is a statement or theory that is put forward as a premise to be maintained or proved. Hope this answers the question. Have a nice day.

The one that most represents the earths mantle would be the skin since the mantle is the upper part of the earths depths which is just like the skin of an apple.