Fact 1: Avalley is formed by a river flowing.

Fact 2: And the fourth river is the Great River, the river Euphrates.

Given the two facts above, answer the question "What does the Euphrates form?" with the following options: 
- erosion
 - a solute
 - a hurricane
 - Bodily water
 - a valley
 - Sediment
 - ancient ruins
 - a mountain


 

     a valley    