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By dropping Mentos into a 2-Liter bottle of soda we can simulate the expansion of gasses from the magma in a volcano. Each Mentos candy has thousands of tiny pits all over the surface. These tiny pits are called nucleation sites – perfect places for carbon dioxide bubbles to form. As soon as the Mentos hit the soda, bubbles form all over the surface of the candy. When all this gas is released, it literally pushes all of the liquid up and out of the bottle in an incredible eruption.