Fact 1: Carbon may be stored in sedimentary rock for millions of years.

Fact 2: Limestone is a type of sedimentary rock.

Given the two facts above, answer the question "where might carbon be stored for million of years?" with the following options: 
- In sediment
 - stomach
 - limestone
 - refrigerator
 - weathering
 - loose dirt
 - Earth
 - body water


 

   limestone      