Dancing raisins!

We are very clever in Room 3.  We can make raisins dance!!!
We added raisins to plain tap water.  The raisins sank to the bottom. 
We added raisins to soda water.  The raisins started dancing!  The raisins went up and down, up and down.  We think the bubbles in the soda water made the raisins dance.  What do you think?