Putting Mentos candy into a bottle of diet cola creates an amazing liquid geyser. The carbon dioxide bubbles in the soda attach themselves to thousands of tiny surface pits in the Mentos candy. The bubbles become numerous, creating gas and rapidly pushing the liquid out of the bottle. The effect is intensified because the heavy Mentos candies sink in the bottle, increasing the number of bubbles produced. PreK through 4th grade This fun video models the lesson, describes the project, the S.T.E.A