Shap cardboard into a broad cone, forming a "crater" at the top with a small plastic cup. Cover the cone with plaster of Paris, being careful to keep plaster from the crater. Allow volcano to dry and paint as desired.
Remember this simple experiment from science class? It's super easy to recreate an erupting volcano at home with your kids. Give it a try with our easy step-by-step how-to.
In a plastic cup, mix 1/4 cup vinegar with a few drops each of dishwashing soap, water, and red food coloring.
Add 1 teaspoon of baking soda to a small empty plastic cup placed inside the volcano crater.
Wearing goggles, quickly pour vinegar mixture into the cup holding the baking soda mixture. Stand back and watch the reaction!