Books that deal with current events in an exciting way often become best sellers. The bolded words are what kind of clause?

Here's why:

* It modifies a noun: The clause describes the type of books that are often best sellers.

* It contains a subject and verb: "Books" is the subject, and "deal" is the verb.

* It functions as an adjective: It provides more information about the noun "books," just like an adjective would.

Let me know if you'd like to explore other types of clauses!