EXERCISE 29 PROBLEMS-PART I The following questions are based on the lower right
ID: 297160 • Letter: E
Question
EXERCISE 29 PROBLEMS-PART I The following questions are based on the lower right (southeast) corner of the "Greasewood Spring, Arizona," quadrangle (Maps T-18 and T-19 shown in color in the back of the Lab Manual): 1. What is the contour interval of the map? 2. What is the difference in elevation between index contours? feet feet 3. What is the elevation of the highest contour line at the top of the eastern Twin Butte? feet 4. What do the dashed blue lines represent? 5. What do the gray lines around and between the Twin Buttes represent? 6. What is the name of the adjoining quadrangle to the south? 7. The latitude of the upper right (northeast) corner of the map is 35°30' N, while the longi- tude of the lower left (southwest) corner of the map is 11000' W. Why is this called a "7.5 minute" topographic map? (Hint: What is "minute" referring to?) 8. At the time this quadrangle was printed, what was the difference (in degrees) between true north and magnetic north for this map? _degrees 9. On all three graphic scales for the map, "o" is not at the far left. Explain the reason for this. 10. Using the graphic map scales, determine the maximum width of the eastern Twin Butte (use the 6100' contour to be the outer edge of the butte). feet kilometers 205Explanation / Answer
Answer:
1. The contour interval is 20 feet.
2. Index contours are the contour lines that are thicker than the rest of the contours and marked with elevation. So, from that information, the index contour interval is 100 feet.
3. The elevation of the highest contour line at the top of the Eastern Twin Butte is 6300 feet.
4. The dashed blue lines represent narrow wash.
5. The gray lines around and between the Twin Butte represent supplementary bathymetric contours.
6. This is quadrangle number 3. To its south, the adjoining quadrangle is 5, which is Arrowhead Butte NE.
7. 1:24000 scale map is called 7.5 minutes topographic map because it covers 7.5 minute of latitiude and 7.5 minute of longitude.
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