(d) Based on your rule of V, does the stream at the west side of Pickerel Pond f
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(d) Based on your rule of V, does the stream at the west side of Pickerel Pond flow into or away from the pond? (e) In what direction does Jim Brown Brook flow (in the southeast corner of the map)? 9.4 Rules and Applications of Contour Maps In the past few sections and exercises, you learned the most important points and techniques to get started with topographic maps. The basic "rules" for reading con- tour lines are mostly common sense, and you figured out the most important ones for yourself in Exercises 9.3 to 9.5. Now in Exercise 9.6, you will summarize what you have learned and then apply it. Exercise 9.7 asks you to create your own topo- graphic map, and Exercise 9.8 shows how understanding these maps could help save your life. EXERCISE 9.6 Rules of Contour Lines on Topographic Maps Name Course: Section: Date:. In Exercise 93, you deduced for yourself the most important "rules" of contour lines, and you will use them in the next several chapters to study landforms produced by streams, glaciers, groundwater, wind, and shoreline currents. Complete the following sentences using what you've just learned to summarize the rules of contour lines (a) Two different contour lines cannot cross because (b) The spacing between contour lines on a map reveals the _ of the ground surface. Closely spaced _ contour lines indicate and widely spaced contour lines indicate (c) Concentric contour lines indicate a (d) Concentric hachured contour lines indicate a . e) Contour lines form a V when they cross a stream. The open part of the Vfaces the (upstream/downstream) direction 9.4 RULES AND APPLICATIONS OF CONTOUR MAPSExplanation / Answer
(a) Two different contour lines cannot cross because then there would two point of elevation/depression present on that point. ( This is not possible because contour represents the point of same level and intersections of two different contours means that on the point of intersection we have two different elevations which is not possible and hence they can never intersect.
(b) The spacing between the contour lines reveals the slope/steepness of the ground surface. Closely spaced contour lines indicate high slope/high steepness and widely spaced contour lines indicate less slope/less steepness. (Since contour lines are made by joining equal point of elevation and the spacing between them represents the distance that is present between two different elevation points and hence if the distance is high then we have low steepness while if the distance is low we have high steepness.
(c) Concentric contour lines indicate symmetrical hill or an symmetrical antiform. (Since the slope is equal in all the direction around the center and the maximum contour line is present at the center while the least at the extreme and hence it is used to represent a symmetrical hill.)
(d) Concentric hachured contour lines indicate a symmetrical depression or a symmetrical basin. (Since the dark nature means that the highest contour is present at the outside while the lowest contour is present at the inside and hence this can only be possible in the case of a depression or a basin.)
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