Which is the angle of depression from the top of the waterfall to Kelley? ∠5 ∠7 ∠6 ∠8

∠6

Explaining: The angle of elevation is the angle between an horizontal line and the line from the object to the observers eyes. The line from the object is above the horizontal line. The angle of elevation denotes the angle from the horizontal upward.
The first picture below is where your question emanated .The second picture describes the angle of elevation. The angle of elevation from kelley to the top of the waterfall is ∠6.