Future Volcanologists?

What happened to the dinosaurs?  No one really knows for sure.  We discussed some of the more popular theories.  One theory says that the volcanoes erupting put too much ash in the atmosphere and blocked out the warmth.  Since we talked about volcanoes, we decided to build working models of them.  We used salt dough molded around pill bottles to make them  and will use vinegar and baking soda to make them erupt.