Ghost Volcanoes Halloween Science
What we used:
white plastic cups
What I did:
I drew simple eyes and mouth on the white cups. Then placed them in a tray and filled them with baking soda. I put drops of food coloring in the cups. I filled a measuring cup with vinegar.
Original article and pictures take http://frogsandsnailsandpuppydogtail.com/ghost-volcanoes-halloween-science/ site