Acavern is formed by carbonic acid in groundwater seeping through rock and dissolving limestone, and caverns are characterized by enormous rooms. Given these facts, what are formed by carbonic acid in groundwater seeping through rock dissolving limestone among the following options:
- oceans
 - Calcium carbonate
 - coral reefs
 - enormous rooms
 - a solute
 - creeks
 - Greenhouse gasses
 - a hydraulic system


 

    enormous rooms     