I read through it and felt it was doable for third graders (although I was a little nervous about the cartooning). I offered my help and we put together the activity.
The kids did it WONDERFULLY. It was one of those lesson you wish was observed (but of course never is :) They are on an alternating science schedule so she only had two of the four classes today but it was a good sampling of children. She had one class that had a high portion of struggling learners and the second class had a high portion of gifted and talented children (so the lesson was completed across the spectrum and every child did wonderfully).
The children rotated between seven stations (see first picture - my printer was running out of ink!). The pictures aren't included in the activity but I thought they would be helpful for kids as they rotated. I printed out two copies of the cubes for each station and that was a GOOD idea (in fact I might recommend three copies of the cube - I color coded the stations and cubes with dots so that I could match the cubes to the right station - another GOOD idea). Some stations got a lot of kids and we had to wait awhile as they rolled and wrote down what happened to them (as a rock) at that station.
Once they were done I had five volunteers (individually) go to their first station, tell us as a group what happened, and we had to guess where they went (example: the child is at the volcanic station and told us that he became volcanic dust and went into the atmosphere and we guessed where he would go next). That is not in the instructions but worked as a review for us.
I modified the cartoon page in the activity to fit in the notebook (right hand activity - see bottom two pictures where they illustrated what happened to them in the rock cycle). Then I gave them lyrics to this song I found on YouTube - which we watched twice...once for viewing and the second time for participation to put on the other side of the notebook (the lyrics were put on the left hand side of the notebook - see fourth picture). I modified the song using Movie Maker Live to cut out the annoying bit in the beginning and end (which would have distracted the students I was working with).
The teacher, students, and myself all had a good time (learning) and the teacher is going to do it unassisted with her other two groups tomorrow.