I believe that the number of majors or minors depends on the college policies. But I’d imagine colleges having either double major, or a major and a minor (besides the regular one major option, of course.
Generally, you don’t have to decide on your major in your first year. Even if you decide on a major in your first year, I’m sure you can eventually switch to other majors in case you change your mind.
The majors can be as different as you like. I know lots of students who double major in Art History and Economics, or Computer Science and English.