Put the yogurt container in the middle of the pan and use the clay to shape a volcano around the container. Leave a hole at the top so you can pour things into the container. Pour the water into the container. Stir in the baking soda, a few drops of red food coloring, and a few drops of detergent. When you're ready for the eruption, pour in the vinegar and stand back.
Eruptions happen when pressure builds up inside a volcano, forcing ash and lava out the top.
In your Model Volcano of Science, the baking soda and vinegar reacted together to make carbon dioxide gas. The gas squirted out of the volcano, bringing the foamy red liquid to the surface. Though the demonstration of using baking soda and vinegar to simulate a volcano is entertaining, it is not all together accurate. The baking soda and vinegar demonstration may simulate, to a limited extent, the explosiveness of a volcano, but does not represent how a volcano truly forms. In your study time, check out books about volcanoes to see how they form, and what causes them to erupt.