A classic science project for students is to create a volcano model. Typically, this project employs the chemical reaction that occurs when baking soda comes into contact with vinegar to demonstrate the mechanics of an eruption. If you are making such a model and wish to add a dose of realism to it, you may want to have some smoke rising from your volcano's crater prior to the eruption. However, there are many obvious hazards associated with creating fire and smoke indoors. Fortunately, using some dry ice, you can create the visual effect of smoke with a relative degree of safety.