Acavern is formed by carbonic acid in groundwater seeping through rock and dissolving limestone, and underground caves and caverns pose an exciting adventure to many. Given these facts, what can be formed by carbonic acid in groundwater seeping through rock and dissolving limestone among the following options:
- water
 - swamp vegetation
 - Calcium carbonate
 - sunlight
 - contamination
 - loose soil
 - underground caves
 - arsenic


 

       underground caves  