A Rockin' Good Time: a rock unit (anchor chart and writing activity). This would be a great way to show the different sizes and states of rocks. It would be very easy to make as well. One thing that I see wrong with it is I would find drawings of the different rocks so that the students could see them.
Wee Science by Laura Candler. Created for primary teachers, this book follows the same format as Hands-on Science. It includes comprehensive cooperative learning lessons on topics such as the rain forest, the senses, leaves, rainbows, electricity, flight, sound, and seeds. The activity directions include detailed instructions and full blackline masters. The book also includes an overview of cooperative learning and co-op structures that have proven successful in thousands of classrooms. ($)
Another Pinner said: "This kept my 2 year busy for an entire hour and my 4 year old busy for 2 hours! YAY! Drop vinegar tinted with food coloring onto a pan filled with baking soda. Sheer minutes of colorful fizziness!!... Pretty sure we will be doing this soon!