Why does a marshmallow dissolve in soda pop?

A marshmallow dissolves in soda pop primarily due to the presence of carbonated water, which contains carbon dioxide gas. When the marshmallow is submerged, the gas bubbles create pressure that can break down its structure, allowing the sugar and Gelatin components to dissolve in the liquid. Additionally, the sugar in the marshmallow is soluble in the soda, further contributing to its dissolution. The overall effect is a combination of physical and chemical interactions that lead to the marshmallow breaking down in the soda.