Answer:
From what I know, compasses and other magnetic things would not work.
Explanation:
<span>When humans remove vegetation from an area, the water cycle is MOST directly affected on the evaporation side. The evaporation in that area will decrease because there'll be no more plants that will hasten the evaporation process. This will create an abnormality in the water cycle.</span>
To calculate the slope, the formula is (y1-y2)/(x1-x2) , which in this case, the answer would be:

Hope it helps!
The answer is trafficking and labor