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I've been looking through the subjects but I don't see an Earth Science category anywhere and it's not a Bio question.
've seen Earth Science questions in Bio, Chem, Physics, and Geography. Use your best judgement I guess. If it is a question about the physical formation of rocks then ask it in Geography but if is a question about the chemical formation of rocks ask it in Chemistry.
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^ Great answer @MathBlonde - thanks!
@ShotGunGirl as of now we don't have a dedicated group for Earth Sciences, but we have some selections that are at least close topic wise to what you are looking for. In cases where there isn't an obvious group selection option, we are more lenient in terms of which group you post it in, so, as MathBlonde said, use your best judgement :)