Get a tray.
Place a small cup on the tray.
Wrap clay around the cup.
Shape clay into a volcano.
Take two spoonfuls of baking soda and put it in the volcano. You may need three or four spoonfuls.
Now get ready to add some food coloring.
Add red food coloring and yellow food coloring before you put in the vinegar.
Here is the red food coloring and the yellow food coloring.