You are presented with the quiz "What are formed by flowing rivers through erosion over long periods of time." 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "most canyons are formed by flowing rivers through erosion over long periods of time" and "smithfield Canyon, a deep gorge through the mountains, dominates the view to the west". 

So, what's the best answer to the question?


 

       deep gorges    