Make a solid volcano with the mould and plaster provided. Paint and decorate your volcano with lava flow, landscapes etc. Put baking soda and vinegar into the "crater" and perform an amazing eruption in front of your friends and family. Your volcano will erupt with bubbly, fizzy lava. It's an awesome science project and it makes a cool desktop decoration, too. The eruption can be performed repeatedly. When constructed, the volcano is approximately 9.5 cm tall.