topic3 Edited WikiTeach Lesson Plan

http://www.wikiteach.org/index.php/Wikiteach/WikiteachWriteMgr/action/edit/iVar/266
I picked a lesson plan on a subject that I knew a little something about. I was extremely hesitant to "tinker" with someone else's work. I hope/guess that's a feeling that will subside with more experience or exposure.
I added another component to Bobby's excellent Rock Cycle lesson plan. If possible, I thought it would be good to have real rock and mineral samples to observe after the Flickr or del.icio.us observations. Although the pictures may be of excellent quality, it's even better to feel and see the real thing.