Fact 1: Acavern is formed by carbonic acid in groundwater seeping through rock and dissolving limestone.

Fact 2: Limestone Limestone Limestone is a grey rock that is made of calcite.

Given the two facts above, answer the question "What is formed when calcite is dissolved?" with the following options: 
- graptolites
 - patch reefs
 - a cavern
 - a solute
 - body water
 - tube
 - In sediment
 - glass


 

   a cavern      