I chose physics knowing that I probably will not go to graduate school for pure physics. I'm interested in interdisciplinary research whether that is in EE, biophysics, or earth science, etc I do not yet know (though I'm leaning geophysics). I switched from engineering to physics because I like the way physicists approach problems and are able to contribute to research outside of the "traditional" fields of physics... not to mention I get to study physics! Lately, I've been wondering if this is the right approach though. I hear of people doing physics and getting into EE, biophysics, geophysics, math grad programs, but how hard is the transition? Do most people in the top ranked geophysics or biophysics programs have geophysics or biophysics undergraduate degrees? It seems as though a geophysics graduate program, for example, would choose someone with a BS in geophysics over someone with a math/physics background and little geology/geophysics, not only due to lack of knowledge on the topic, but also because it would seem obvious that the geophysics major would be more "committed" to the topic. I'm planning on getting a minor in geology and doing research in geophysics to help convince graduate programs that I'm serious, but is this good enough? Is the minor even necessary or should I instead focus on getting as much math/CS/physics as I can before graduate school? Sorry for the somewhat unstructured post... to recap: -Do top ranked graduate programs typically accept people with a different background? -How important is a minor if your background isn't in that field?