Acavern is formed by carbonic acid in groundwater seeping through rock and dissolving limestone, and any time water and carbon dioxide mix, carbonic acid is the result. Given these facts, which of the following added to groundwater creates caverns among the following options:
- a solute
 - permineralization
 - calcite
 - storing water
 - flooding
 - salinity
 - carbon dioxide
 - heating liquids


 

       carbon dioxide  