Explain why the normal force and the force of gravity acting on a book as it sits on a desk are not Newton’s Third Law of Motion force pairs. in 35length wording like a 9th grader

The normal force and the force of gravity on a book aren't Newton's Third Law force pairs because they are acting on different objects. The force of gravity is pulling the book downwards towards the Earth, while the normal force is pushing upwards on the book from the desk. In Newton's Third Law, the force pairs act on the same objects, but in opposite directions. But in this case, the normal force and the force of gravity are acting on different objects - the desk applies the normal force on the book, while the Earth applies the force of gravity on the book. Therefore, they are not an example of Newton's Third Law force pairs.