Why does elephant toothpaste shoot up?

Elephant toothpaste shoots up due to a rapid decomposition of hydrogen peroxide facilitated by a catalyst, typically yeast or potassium iodide. This reaction produces oxygen gas, which creates a large volume of foam as the soap captures the gas bubbles. The foam expands quickly, resulting in the characteristic "toothpaste" eruption. The dramatic increase in volume and the exothermic nature of the reaction contribute to the impressive height of the foam.