Page 283 - Laboratory Manual in Physical Geology

A CTIVIT Y 9.3 Topographic Map Construction

Name: ______________________________________ Course/Section: ______________________ Date: ___________

A. Use interpolation and extrapolation to estimate and label C. Using a contour interval of 10 feet, label the elevation of

elevations of all points below that are not labeled (see every contour line on the map below. ( Hint: Start at sea

FIGURE 9.12 for help). Then add contour lines using a contour level and refer to FIGURES 9.13 and 9.14 .)

interval of 100 feet. Notice how the 0-foot and 100-foot
contour lines have already been drawn.
500
600
600
600
BM675
600
500
500
300
500
600
550 300
400
500
300
500 450

400
300
100
200 100
350 300 200 100
0
200
100
200 Ocean
250
100

B. Contour the elevations on the map below using a contour
interval of 10 feet. Refer to FIGURE 9.12 as needed.

112 100 78 90 106
Stream

115 103 84 110 111

Ocean
122 110 98 107 116

125 118 110 113 123

D. REFLECT & DISCUSS The elevations in FIGURE 9.1C are in feet above sea level. What is the the contour interval of the
map, and how did you determine it?

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