The diagram below shows stream gradient. If a stream has a horizontal distance of 10 km and begins at an elevation of 100 m higher than where it ends, what is its stream gradient?
A. 10 km + 100 m = 110 km/m
B. 100 m / 10 km = 10 m/km
C. 10 km / 100 m = .10 km/m
D. 100 m * 10 km = 1000 m/km
