You are presented with the question "What moving downhill due to the force of gravity can dissolve carbon in sedimentary rock?" and the following answer choices: 
- river
 - Raft
 - pebbles
 - rain
 - water
 - sand
 - oxygen
 - craters

Now knowing that flowing water can slowly dissolve carbon in sedimentary rock and water falls from the sky and flows downhill due to the force of gravity, choose the best answer.


 

     water    