Fact 1: Flowing water can slowly dissolve carbon in sedimentary rock.

Fact 2: Sedimentary Rocks One of the commonest sedimentary rocks is sandstone.

Given the two facts above, answer the question "Flowing water can slowly dissolve carbon in what?" with the following options: 
- oil
 - water
 - crust
 - ice
 - loose dirt
 - sandstone
 - precipitation
 - loose soil


 

      sandstone   