The answer to your fine question is D.
I can't tell you the answer because there is no image but to find a perpendicular lines slope you just take the slope and make it opposite.
Ex: Slope is 1/2 what is the perpendicular?
Ans: -2/1
a region that is made up of different places that are linked and function as a unit
Characteristics of a rejuvenated river include water that flows rapidly with sloping sides that create steep cuts on the valley floor.
