Differences between a CV and a resume?

Hey folks. I've spent a lot of time in the last six months to listen to the majority of the Manager Tools/Career Tools podcasts, and I love them. They've given me a lot of insight into not just the realm of work life, which I have yet to enter, but also in my everyday interactions with people.

I'm a highschool graduate with a few months to go until college, and I decided to compete with the local college grads for a few summer apprenticeships in the IT sector. Most of them require some college experience, so I don't have high chances, but hey, showing up is the first step to winning right? The positions require a CV, for some it is accompanied by a cover letter. 

I initially approached writing my CV as if writing a resume. This obviously doesn't work, since I have no work experience and only a few accomplishments - a Career Tools-style resume with my credentials ends before the first third of the page. Google tells me to describe my entire life in a CV. In what way is a CT-style CV different from a CT-style resume?

Further, since I'll probably be the only highschool applicant in a pile of college resumes, for the positions which don't require a cover letter, is there a way to highlight that the lack of college is not a mistake (me sending an outdated document)?