224 FIRST YEAR COURSE IN GENERAL SCIENCE 



EXERCISE ON A SIMPLE CONTOUR MAP 



FIG. 118. CONTOUR MAP 



Contour interval: 100 feet 



Horizontal scale : 1 inch = 1 mile 



1. Fig. 118 is a contour map of a mountain ridge with a stream 

 on one side. What is the height of the summit above sea level? 



2. Trace a copy of this map upon exercise paper. Rule a line 

 from a point representing the top of the mountain to the base in the 

 direction of the steepest slope. Label the line. 



3. Rule a line indicating the direction of the gentlest slope. 



4. In general, how do you distinguish a gentle slope from a steep 

 slope? 



5. In particular, how do you select the gentlest slope? The steepest 

 slope? 



6. What is the length of the river shown on the map? 



7. What is its average fall per mile? 



8. Calculate the actual length of the shortest path from the 

 summit to the base of the mountain. (Put down your calculations.) 



