Why do fizzy drinks fizz up when you put a mint into it?

Ima take a wild guess that soda pop fizz means Diet Coke....

This reaction is an example of the dissolved Why_do_diet_coke_and_mentos_react(carbon dioxide) within diet coke, quickly bubbling out of solution as a result of Mentos being dropped in.

The surface of Mentos candies, or mentos mints are high in surface area, and are bumpy and pitted. Bumpy surfaces tend to "seed" bubbles out of carbonated drinks, such as diet coke. What is meant by "seeding" this means is that when a gas is dissolved in a solution, it remains within the solution in microscopic bubbles. If there is an area where these microscopic bubbles can gather, they will do so to create a larger bubble (due to the hydrophobic effect). Areas that promote these microscopic bubbles to gather are called "seeds". Eventually the bubble will be too large to simply stay in solution and Why_do_diet_coke_and_mentos_reactto rise to the surface, often as a visible tiny bubble.