In the classroom, we made a model volcano together and used the explosive mixture of baking soda and vinegar to make it erupt.
Once we had our dinosaurs in place, we put baking soda in the crater (and into the glass vase). Next, we put food coloring and vinegar in a plastic cup. Each child was allowed to decide what color lava they wanted to make when it was their turn to pour in the vinegar. By the end, we were mixing colors to see what would come out.
Then we poured the vinegar in and here is the exciting result.
We will have the volcano erupting as long as it is still holding the kids' interest in the science area all next week.