Fact 1: Avalley is formed by a river flowing.

Fact 2: Examples are Napa Valley and Sonoma Valley.

Given the two facts above, answer the question "what were formed by a river flowing?" with the following options: 
- Statue of Liberty
 - body water
 - swamp vegetation
 - Rockies
 - Napa and Sonoma
 - clouds
 - Sediment
 - Calcium carbonate


 

     Napa and Sonoma    