Aspiring Geophysicist
I would recommend to do an undergraduate in physics.

I work at a department of Meteorology.  When faculty hire a new PhD student or postdoc, they often prefer those with an undergraduate in Physics than with an undergraduate in Meteorology.  The Physics degree gives a better preparation for doing science.  It has more maths and physicists are more likely to have some programming experience than meteorologists.  For most scientific positions, such programming experience is highly valuable.  It appears the meteorologists are more likely to end up in jobs like weather forecasting or energy trading, rather than science.

Although this experience may be quite localised, a physics undergraduate degree does give you a more generic background.  It's easier to catch up on the specifics of geophysics when you have a physics background, than the other way around.