We recently finished our volcano unit study. We completed 2 add on experiments outside and made the lapbook V is for Volcano from In the Hands of a Child.
Cameron loved the graphics as well as the activities themselves.
If you haven't had an opportunity to try a lapbook project pack from In the Hands of a Child, I would highly recommend V is for Volcano for PreK-2nd grade. The traceable font and the matching style activities are great for the early learner level, while the concepts are solid enough to really understand volcanos and their workings.
The ladies at In the Hands of a Child make the whole learning process and the planning process simple for moms and fun for the kids. We spent about 6 class days working on the project and Cameron loves showing off his completed lapbook.
Another great thing about In the Hands of a Child... they offer a semi-annual freebie. Currently (through the end of June 2009) the project pack freebie is Ecosystems. You can download the freebie as well as a current catalog from the website and try out a project pack.