Geography as Earth Science?

[sweeties_tweety]

Hi there. I apologize straight away for not posting this in the 'student teachers' forum, but I think that 'veteran' teachers would be able to help me more with my query. I am currently studying to be a Geography teacher in the UK, however I am soon to marry my fiance (a US citizen- hes so cute- hee hee) next year and so will soon be living over in your great country. However, Ive noticed that my subject area doesnt really appear to exist as a subject on its own in your schooling system, though looking more closely at 'earth science' it seems as though my main subject knowledge area (geology, hydrology, meteorology) falls more predominately under the latter category (with the exception being that I have no knowledge of astronomy). Therefore I was wondering whether it would be possible to become licensed as an earth science teacher providing I undergo private individual study in the area of astronomy (and hence pass those particular praxis exams) or will state licensers require that I actually have an undergraduate degree in earth science? I understand that this is probably a difficult question to ask but I would greatly appreciate any advice that anyone could give me.
Donna