What is this piece of grammar called?

[jirikoo]

Hi fellas,

can anyone clarify me on those sentences "the more...the more..."

For instance "The more I eat, the thicker I get."

or

"The faster you go, the more fuel you burn.

What are this clauses offically called? I need it for an assignment.

thanks

[Soup]

comparative correlatives - Google Search

Ex: The more you eat, the fatter you get.