Which feature is most likely to have been formed by wind? a. canyon b. root pry c. sand dune d. u-shaped valley

 it is a sand dune   and a canyon is formed by water and the wind. hope this helps   

The correct answer for this question is that a statement that can be proven by observation or measurement is known as a fact. The other possible answers here simply refer to idea that different individuals can place value on, but that are not necessarily known to be true.