You are presented with the question "what were formed by a river flowing?" and the following answer choices: 
- Statue of Liberty
 - body water
 - swamp vegetation
 - Rockies
 - Napa and Sonoma
 - clouds
 - Sediment
 - Calcium carbonate

Now knowing that avalley is formed by a river flowing and examples are Napa Valley and Sonoma Valley, choose the best answer.


 

     Napa and Sonoma    