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IMO one of the most important things is to make sure the classes are transferable and will actually satisfy curriculum requirements. Sometimes, even if the study abroad program is run through the school, not *all* the classes are automatically transferable.
I have no idea what the cities are, but sometimes if you book the flights far in advance (which you can because you know the dates for the academic calendar FAR in advance), it can be really cheap. If I were you/your family, I would check southwest for flights, and if you book them soon you could get them for really cheap.
Please get off CC until you're AT LEAST a sophomore in high school. My parents ruined my middle school years by making it all about straight As. Develop good study habits of course, but worrying about it right now will do nothing !
All of those will be easier than chem/phys in terms of the mathematics required, but in my personal subjective opinion, I think that geology and weather are more interesting and easier at the same time.