# 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? $\qquad$ feet
2. What is the difference in elevation between index contours? $\qquad$ feet
3. What is the elevation of the highest contour line at the top of the eastern Twin Butte? $\qquad$ feet
4. What do the dashed blue lines represent? $\qquad$
5. What do the gray lines around and between the Twin Buttes represent? $\qquad$
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 $35^{\circ} 30^{\prime} \mathrm{N}$, while the longitude of the lower left (southwest) corner of the map is $110^{\circ} 00^{\prime} \mathrm{W}$. 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? $\qquad$ degrees
9. On all three graphic scales for the map, " 0 " 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 $6100^{\prime}$ contour to be the outer edge of the butte). $\qquad$ feet
kilometers

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? $\qquad$ feet
2. What is the difference in elevation between index contours? $\qquad$ feet
3. What is the elevation of the highest contour line at the top of the eastern Twin Butte? $\qquad$ feet
4. What do the dashed blue lines represent? $\qquad$
5. What do the gray lines around and between the Twin Buttes represent? $\qquad$
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 $35^{\circ} 30^{\prime} \mathrm{N}$, while the longitude of the lower left (southwest) corner of the map is $110^{\circ} 00^{\prime} \mathrm{W}$. 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? $\qquad$ degrees
9. On all three graphic scales for the map, " 0 " 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 $6100^{\prime}$ contour to be the outer edge of the butte). $\qquad$ feet
kilometers

StudyXY · Accepted Answer

I'm here to help! Before I can provide a solution, I need to clarify a few things.                 "7.5 minute" topographic map: This refers to the map scale, which is based on the size of a minute of latitude.  "0" marks not at the far left: This could be due to the map projection or the specific scaling used.   (5 \ 	ext{contour lines}) 	imes (40 \ \frac{	ext{feet}}{	ext{contour line}}) = 200 \ 	ext{feet}

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