National Geographic Volcano Science - Build Your Own VolcanoVolcanoes + Eruptions = Awesome Science Fun! Create an eruption with National Geographic Volcano Science Build Your Own Volcano. Your child will get to cast their own volcano (plaster and mould included), paint it (paint and brush provided), and then make it erupt (includes eruption powder)! This is a great family activity and provides hours of fun for all ages. Included in the kit: 1 Bag of Plaster (14. 5 oz 410 g) 1 Bag of Eruption Powder A (0. 8 oz