Mathematics major but not sure need HELP PLEASE!!

<p>Okay so in college I really want to also pursue intramural sports because that’s what I like so I probably wouldn’t have time your saying if I did a triple major in mathematics, economics, and geology. Also does anyone know if geology can tie in with marine biology. And if I just perhaps went first to pursue in mathematics would I easily be add in the other majors. And I definitely am gonna major in applied math:).</p>