Question

If a slowly running stream in the hydrosphere runs down off a mountain and passes over a plain, which of the following shows how the surface of the earth might change over a long period of time?
A. a canyon will form
B. a plateau will form
C. there will be no change
D. an ocean will form

Answer 1

I would put option A. 

The question says how the surface MIGHT change over a long period of time so that's why I wouldn't say option C, and that's how canyons are formed if I'm not mistaken. 

I hope this helps. My apologies if I'm wrong. 

Answer 2

I just took the test on plato and C was wrong.