<p>I’ve not heard of any professional geoscience career today (either gov’t, education, or private sector) that hires with only an undergraduate degree.</p>
<p>Graduate students in the natural sciences very frequently get full scholarships and teaching assistanceships or research assistanceships (i.e. “a job”) as they pursue their degree. </p>
<p>Since there is a lot of course overlap for different physical science majors, you probably don’t need to commit to a major right away. I would look at the course requirements for the different majors and schedule the courses strategically to preserve your options.</p>