You are presented with the quiz "Where can one readily see the geologic history of an area?" 

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 "striations in rock forms are seen along the river and tell the geologic history of the area". 

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


 

     canyon      