Does Earth sciences mean geology, or does it include Biology (since the study of soil ==ie part of the earth-- is part of biology.
The Earth Sciences cover mainly topics in Geology, Meteorology, Climatology, Oceanography, Physical Geology/Geography (which is a combo of geo, met, ocean, & astro).
Soil sciences is usually combined within Biology, Environmental and Land Resources.Jersey Jay covered the basics. Just start. Get your application in, then try and go by the colleges when the chair or whoever does the scheduling is likely to be around to deliver the CV in person. If you don't actually meet the chair, email him or her with your CV and ask for an interview.
I don't know where you are, how many ccs are near you, or what your field is like (I was a composition adjunct for two years), but they tend to need adjuncts for the core classes. Most of the time, after I submitted my info, I got a call for an interview, and at the interview I was offered classes.
Good luck!
I am located in SW Florida region. As far as I know, there are three main cc's around here with a few expansion branches. Interestingly enough, there is one cc that within the last two-three years has gone from a community college to a college. So I am not too sure on their requirements for hiring adjuncts since they have made the transition.
However, many of the local cc's offer on-campus, online, and correspondance courses, and I would be willing to take a combination of anything to get my foot in the door and gain some experience.