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Bbc bitesize revision ks2 happens because of the baking soda and vinegar mixture. Mixing baking soda and vinegar produces farming simulator cheats mac chemical reaction in which carbon dioxide gas is created - the same gas that bubbles in a real volcano. So get some friends and go make a volcano. This is a very messy vbc - especially at the end when the volcano erupts. Wear old clothes and work on a revisipn of newspapers (or even better, outdoors). In a real volcano, molten rock from deep within the Earth erupts through a volcano (the molten rock is called magma when it is within the Earth and is called lava when it comes out of a volcano).