You are presented with the question "Flowing water can slowly dissolve carbon in what?" and the following answer choices: 
- oil
 - water
 - crust
 - ice
 - loose dirt
 - sandstone
 - precipitation
 - loose soil

Now knowing that flowing water can slowly dissolve carbon in sedimentary rock and sedimentary Rocks One of the commonest sedimentary rocks is sandstone, choose the best answer.


 

      sandstone   