Start with all your old playdough! Mix it together for that great swirly look! (Or make a batch click here for recipe.)
You will also need a big ole piece of sidewalk chalk.
Place a handful of playdough on a plastic plate.
Push the chalk into the playdough to create a volcano shape. Squish the sides into a nice volcano shape. Leave that chalk there and let the playdough dry. (Remove the chalk after a few hours so it will dry inside as well!)
Once the volcano is dry (may take a few days!), you are ready to put a heaping tablespoon of baking soda into the center of that volcano.
I prepare a cup of vinegar that I have colored with red food dye for each child.
We "explode" our volcanoes outside! So much fun! A kindergarten favorite!