(Solved): 9. The following diagram is a contour map. (a) Which direction does the stream flow? How do you kno ...

9. The following diagram is a contour map. (a) Which direction does the stream flow? How do you know? (b) Calculate the approximate stream gradient in meters per kilometer between $A$ and $B$ given that the scale of this map is $1\mathrm{cm}=2\mathrm{km}$. Stream gradient is calculated as the drop of a river divided by its length and length is measured along the stream course. To get a good estimate of the length of the stream, use one of the pieces of string available in the lab. SCALE: 1 Centimeter $=2$ Kilometers Contour Interval = 10 Meters