This teacher did this for a preschool lesson, but it can be adapted for older kids. They could drop or open the balloons and observe what happens to the solid liquid and gas inside it. This would help identify the properties of solids, liquids and gases.
Clouds in Jar- preschool. water with shaving cream on top (clouds) then pour colored water in a droper on top the clouds and watch as it goes thru the cloud and into the water.Good site on preschool stuff
Grow a Lima bean plant in a CD case. Then label it with a paint pen. So clever, A sharpie would work too! I wonder if the super thin case would work as well as the older thick? I think you would have to find a very thin bean!